Below is a list of issued US Patents owned by or licensed to CiDRA. Many other patents are pending. CiDRA products and/or services may be covered by one or more of the below-listed US patents or foreign counterparts thereto. Please return to this site often to obtain the latest list of issued CiDRA US patents. You may obtain a copy of these patents from www.USPTO.gov.

US Patent		Issue Date		Title
5,767,411		6/16/98		Apparatus for Enhancing Strain in Intrinsic Fiber Optic Sensors and Packaging Same for Harsh Environments
5,844,667		12/1/98		Fiber Optic Pressure Sensor with Passive Temperature Compensation
5,877,426		3/2/99		Bourdon Tube Pressure Gauge with Integral Optical Strain Sensors for Measuring Tension or Compressive Strain
5,892,860		4/6/99		Multi-Parameter Fiber Optic Sensor for use in Harsh Environments
5,925,879		7/20/99		Oil and Gas Well Packer having Fiber Optic Bragg Grating Sensors for Downhole Insitu Inflation Monitoring
5,945,665		8/31/99		Bolt, Stud or Fastener having an embedded Fiber Optic Bragg Grating Sensor for Sensing Tensioning Strain
5,973,317		10/26/99		Washer having Fiber Optic Bragg Grating Sensors for Sensing a Shoulder Load between Components in a Drill String
5,986,749		11/16/99		Fiber Optic Sensing System
5,987,197		11/16/99		Array Topologies for Implementing Serial Fiber Bragg Grating Interferometer Arrays
6,009,216		12/28/99		Coiled Tubing Sensor System for Delivery of Distributed Mulitplexed Sensors
6,016,702		1/25/00		High Sensitivity Fiber Optic Pressure Sensor for use in Harsh Environments
6,072,567		6/6/00		Vertical Seismic Profiling System having Vertical Seismic Profiling Optical Signal Processing Equipment and Fiber Bragg Grafting Optical Sensors
6,118,914		09/12/00		Method and Device for Providing Stable and Precise Optical Reference Signals
6,137,621		10/24/00		Acoustic Logging System using Fiber Optics
6,175,108		1/16/01		Accelerometer Featuring Fiber Optic Bragg Grating Sensor for Providing Multiplexed Mulit-Axis Acceleration Sensing
6,191,414		02/20/01		Composite form as a component for a Pressure Transducer
6,227,114		5/8/01		Select Trigger and Detonation System using an Optical Fiber
6,229,827		05/8/01		Compression-Tuned Bragg Grating and Laser
6,233,374		5/15/01		Mandrel-Wound Fiber Optic Pressure Sensor
6,249,624		06/19/01		Method and Apparatus for Forming a Bragg Grating with High Intensity Light
6,252,656		6/26/01		Apparatus and Method of Siesmic Sensing Systems using Fiber Optics
6,271,766		8/7/01		Distributed Selectable Latent Fiber Optic Sensors
6,274,863		8/14/01		Selective Aperture Arrays for Seismic Monitoring
6,278,811		8/21/01		Fiber Optic Bragg Grating Pressure Sensor
6,279,660		8/28/01		Apparatus for Optimizing Production of Mulit-Phase Fluid
6,298,184		10/02/01		Method and Apparatus for Forming a Tube-Encased Bragg Grating
6,305,227		10/23/01		Sensing Systems Using Quartz Sensors and Fiber Optics
6,310,990		10/30/01		Tunable Optical Structure Featuring Feedback Control
6,317,555		11/13/01		Creep-Resistant Optical Fiber Attachment
6,321,007		11/20/01		Optical Fiber Having a Bragg Grating Formed in Its Cladding
6,338,579		1/15/02		Fiber Optic Sleeve Assembly for use at a Splice Junction of a Fiber Optic Cable
6,346,702		02/12/02		Fiber Bragg Grating Peak Detection System and Method for Doing the Same.
6,351,987		3/5/02		Fiber Optic Pressure Sensor for DC Pressure and Temperature
6,354,147		3/12/02		Fluid Parameter Measurement in Pipes using Acoustic Pressures
6,363,089		03/26/02		Compression-Tuned Bragg Grating and Laser.
6,403,949		06/11/02		Method and Apparatus for Correcting Systematic Error in a Wavelength Measuring Device.
6,404,961		6/11/02		Optical Fiber Cable having Fiber in Metal Tube Core with Outer Protective Layer
6,414,303		7/2/02		High Accuracy Bragg Grating Based Pressure Sensor with Dual Resolution Mode
6,422,084		7/23/02		Bragg Grating Pressure Sensor
6,435,030		8/20/02		Measurement of Propagating Acoustic Waves in Compliant Pipes
6,439,055		8/27/02		Pressure Sensor Assembly Structure to Insulate a Pressure Sensing Device from Harsh Environments
6,443,226		9/3/02		Apparatus for Protecting Sensors within a Well Environment.
6,445,868		9/3/02		Optical Fiber Feedthrough Assembly and Method of Making Same
6,448,551		9/10/02		Fiber Bragg Grating Sensor System having Enhanced Strain-to-Wavelength Responsivity by using a Spectral Beating Based Vernier Effect
6,450,037		09/17/02		Non-Instrusive Fiber Optic Pressure Sensor for Measuring Unsteady Pressures within a Pipe.
6,452,667		9/17/02		Pressure-Isolated Bragg Grating Temperature Sensor
6,453,108		09/17/02		Athermal Bragg Grating Package with Coarse and Fine Mechanical Tuning.
6,456,771		09/24/02		Optical Fiber with a Pure Silica Core Having a Bragg Grating Formed in its Core and a Process for Providing Same.
6,462,329		10/08/02		Fiber Bragg Grating Reference Sensor for Precise Reference Temperature Measurement.
6,463,813		10/15/02		Displacement Based Pressure Sensor Measuring Unsteady Pressure in a Pipe
6,466,716		10/15/02		Optical Fiber Having a Bragg Grating in a Wrap that Resists Temperature induced changes in Length.
6,470,036		10/22/02		Tunable External Cavity Semiconductor Laser Incorporating Tunable Bragg Grating.
6,490,931		12/10/02		Fused Tension-Based Fiber Grating Pressure Sensor
6,496,625		12/17/02		Transmission Cable Optical Fiber Protector and Method
6,501,067		12/31/02		Apparatus for Protecting Sensing Devices
6,507,693		01/14/03		Creep-Resistant Optical Fiber Attachment.
6,519,388		02/11/03		Tube-Encased Fiber Grating
6,526,212		02/25/03		Optical Fiber Bulkhead Feedthrough Assembly and Method of Making Same.
6,529,923		03/04/03		Method for Improving the Accuracy in the Determination of a Waveform Center
6,536,291		03/25/03		Optical Flow Rate Measurement Using Unsteady Pressures
6,550,342		04/22/03		Circumferential Strain Attenuator
6,558,036		5/6/03		Non-Intrusive Temperature Sensor For Measuring Internal Temperature of Fluids Within Pipes
6,563,968		05/13/03		Tunable Optical Structure Featuring Feedback Control
6,575,033		6/10/03		Highly Sensitive Accelerometer
6,587,798		7/1/03		Method and System for Determining the Speed of Sound in a Fluid within a Conduit
6,594,081		07/15/03		Actuator Mechanism for Tuning an Optice Device
6,594,288		07/15/03		Tunable Raman Laser and Amplifier
6,594,410		07/15/03		Wide Range Tunable Optical Filter
6,597,711		07/22/03		Bragg Grating based laser
6,601,411		08/05/03		Method for Annealing an Optical Waveguide Having a Bragg Grating
6,601,458		8/5/03		Distributed Sound Speed Measurements for Multiphase Flow Measurement
6,601,671		8/5/03		Method and Apparatus for Seismically Surveying an Earth Formation in Relation to a Borehold
6,609,069		08/19/03		Method and Apparatus for Determining the Flow Velocity of a Fluid within a Pipe
6,621,957		09/16/03		Temperature Compensated Optical Device
6,626,043		09/30/03		Fluid Diffusion Resistent Glass-Encased Fiber Optic Sensor
6,633,695		10/14/03		Compression-Tuned Grating Based Optical Add/Drop Multiplexer
6,668,656		12/30/03		Optical Sensor having Differing Diameters
6,685,361		02/03/04		Fiber Optic Cable Connections for Downhole Applications
6,690,866		02/10/04		Optical Fiber Cable for use in Harsh Environments
6,691,584		02/17/04		Flow Rate Measurement Using Unsteady Pressures
6,698,297		03/02/04		Venturi Augmented Flow Meter
6,732,575		05/11/04		Fluid Parameter Measurement in Pipes Using Acoustic Pressures
6,753,034		06/22/04		Method of Metallization of an Optical Waveguide
6,763,043		07/13/04		Tunable Grating Based Dispersion Compensator
6,768,825		07/27/04		Optical Sensor Device Having Creep-Resistant Optical Fiber Attachments.
6,776,045		08/17/04		Bragg Grating Pressure Sensor for Industrial Sensing Applications.
6,782,150		08/24/04		Apparatus for Sensing Fluid In a Pipe
6,785,004		08/31/04		Method and apparatus for interrograting fiber optic sensors
6,789,424		09/14/04		Highly sensitive accelerometer
6,792,009		09/14/04		Tunable Grating-Based Channel Filter Parking Device.
6,804,693		10/12/04		Method for Reducing Skew in a Real-time Centroid Calculation.
6,810,178		10/26/04		Large diameter optical waveguide having blazed grating therin
6,813,013		11/02/04		Pressure isolated bragg grating temperature sensor
6,813,962		11/09/04		Distributed sound speed measurements for multiphase flow measurement
6,820,489		11/23/04		Optical differential pressure sensor
6,826,343		11/30/04		Large diameter multi core waveguide
6,834,142		12/21/04		Optical grating based filter
6,837,098		01/04/05		Sand monitoring within wells using acoustic arrays
6,840,114		01/11/05		Housing on the exterior of a well casing for fiber sensors
6,856,729		02/15/05		Wavelength monitor utilizing a tunable bragg grating and blazed grating
6,862,920		03/08/05		Fluid Parameter Measurement in Pipes using acoustic pressures
6,865,194		03/08/05		Strain Isolated Bragg Grating Temperature Sensor
6,868,737		03/22/05		Circumferential strain attenuator
6,877,378		04/12/05		Fluid Diffusion resistant glass-encased fiber optic sensor
6,888,972		05/03/05		Multiple component sensor mechanism
6,889,562		05/10/05		Flow Rate Measurement for industrial sensing applications using unsteady pressures
6,891,621		05/10/05		Highly sensitive cross axis accelerometer
6,898,338		05/24/05		A Fabry-Perot element based on a large-diameter optical waveguide
6,898,541		05/24/05		Method and apparatus for determining component flow rates for a multi-phase flow
6,915,048		07/05/05		Fabry-perot filter/resonator
6,922,277		07/26/05		Optical interleaver/deinterleaver device having an array of mirco-mirrors
6,934,069		08/23/05		Chromatic dispersion compensation device having an array of micromirrors
6,947,640		09/20/05		Alignment and imaging system for writing bragg gratings
6,955,085		10/18/05		Optical Accelerometer or displacement device using a flexure system
6,956,687		10/18/05		Optical blocking filter having an array of micromirrors
6,957,574		10/25/05		Well integrity monitoring system
6,959,604		11/01/05		Non-Intrusive fiber optic pressure sensor for measuring unsteady pressures in a pipe
6,971,259		12/06/05		Fluid density measurement in pipes using acoustic pressures
6,982,996		01/03/06		Large diameter optical wave guide, grate and laser
6,986,276		01/17/06		Deployable mandrel for downhole measurements
6,988,411		01/24/06		Fluid parameter measurement in pipes using acoustic pressures
6,995,352		02/07/06		Fiber optic based method and system for determining and controlling position of a sliding sleeve valve
6,996,316		02/07/06		Large diameter D-shaped waveguide and optical coupler
7,006,206		02/28/06		Method and apparatus for detecting peaks in an optical signal using a cross-correlation filter
7,013,729		03/21/06		Highly sensitive accelerometer
7,019,883		03/28/06		Dynamic optical filter having a spatial light modulator
7,028,538		04/18/06		Sand monitoring within wells using acoustic arrays
7,028,543		04/18/06		System and method for monitoring performance of downhole equipment using fiber optic based sensors
7,032,432		04/25/06		Apparatus and method for measuring parameters of a mixture having liquid droplets suspended in a vapor flowing in a pipe
7,052,185		05/30/06		Fiber optic cable connectors for downhole applications
7,058,549		06/06/06		Apparatus and method for measuring unsteady pressures within a large diameter pipe
7,059,171		06/19/06		Fluid density measurement in pipes using accoustic pressures
7,059,172		06/13/06		Fluid density measurement in pipes using accoustic pressures
7,062,126		06/13/06		Large diameter optical waveguide having bragg grating and being configured for reducing the bulk modulus of compressibility
7,062,976		06/20/06		An apparatus and method for measuring gas volume fraction of a fluid flowing within a pipe
7,068,897		06/27/06		Method for restoring or increasing photosensitivity in hydrogen or deuterium loaded large diameter optical waveguide
7,080,529		07/25/06		A method for making large diameter optical waveguide having bragg grating and being configured for reducing the bulk modulus of compressibility
7,086,278		08/08/06		Measurement of entrained and dissolved gasesin process flow lines
7,096,719		08/29/06		Apparatus for measuring parameters of a flowing multiphase mixture
7,110,893		09/19/06		Method and apparatus for measuring a parameter of a fluid flowing within a pipe using an array of sensors
7,121,152		10/17/06		A portable flow measurement apparatus having an array of sensors
7,123,833		10/17/06		Dynamically reconfigurable optical smart node
7,124,818		10/24/06		Multiple Component Sensor Mechanism
7,126,740		10/24/06		Multifunctional optical device having a spatial light modulator with an array of micromirrors.
7,127,360		10/24/06		Dual function flow measurement apparatus having an array of sensors
7,134,320		11/14/06		Apparatus and method for providnig a density measurement augmented for entrained gas
7,139,667		11/21/06		Method for calibrating a volumetric flow meter having an array of sensors
7,146,864		12/12/06		An apparatus having a multiband sensor assembly for measuring a paramenter of a fluid flow flowing within a pipe
7,150,202		12/19/06		Method and apparatus for measuring characteristics of core-annular flow
7,152,003		12/19/06		Method and apparatus for determining a quality metric of a measurement of a fluid parameter
7,152,460		12/26/06		An apparatus and method for compensating a coriolis meter
7,155,074		12/26/04		A pressure transducer featuring large diameter configured for reducing the bulk modulus of compressibility thereof
7,165,464		01/23/07		An apparatus and method for providing a flow measurement compensated for entrained gas
7,171,315		01/30/07		Method and apparatus for measuring a parameter of a fluid flowing within a using sub-array processing
7,180,601		02/20/07		Optical system featuring chirped Bragg Grating Etalon for providing precise reference wavelengths
7,181,955		02/27/07		Apparatus and method for measuring multi-phase flows in pulp and paper industry applications
7,197,938		04/03/07		Contact-based transducers for charactarizing unsteady pressures in pipes
7,197,942		04/03/07		Apparatus for measuring velocity and flow rate of a fluid having a non-negligible axial mach number using an array of sensors
7,209,606		04/24/07		A Fabry-Perot Element Based on a Large-Diameter Optical Waveguide
7,237,440		07/03/07		A flow measurement apparatus having strain-based sensors and ultrasonic sensors
7,245,385		07/17/07		Characterizing unsteady pressures in pipes using optical measurement devices
7,253,742		08/07/07		Method and apparatus for measuring parameters of a fluid flowing within a pipe using a configurable array of sensors
7,253,897		08/07/07		Optical spectrum analyzer
7,261,002		08/28/07		Flow rate measurement using unsteady pressures
7,269,316		09/11/07		Method for restoring or increasing photosensitivity in hydrogen or deuterium loaded large diameter optical waveguide
7,275,421		10/02/07		Apparatus and method for measuring parameters of a mixture having solid particules suspended in a fluid flowing in a pipe
7,295,933		11/13/07		Configurable multi-function flow measurement apparatus having an array of sensors
7,299,705		11/27/07		An apparatus and method for augmenting a coriolis meter
7,302,861		12/04/07		A portable flow measurement apparatus having an array of sensors
7,308,820		12/18/07		Piezocable based sensor for measuring unsteady pressures inside a pipe
7,322,245		01/29/08		Apparatus and method for measuring a fluid flowing in a pipe using acoustic pressures
7,322,251		01/29/08		Method and apparatus for measuring a parameter of a high temperature fluid within a pipe using an array of piezoelectric based flow sensors
7,328,113		02/05/08		Method for calibrating a volumetric flow meter having an array of sensors
7,328,624		02/12/08		Probe for Measuring Parameters of a Flowing Fluid and/or Multiphase Mixture
7,330,797		02/12/08		An Apparatus and Method for Measuring Settlement of Solids in a Multiphase Flow
7,337,075		02/26/08		Apparatus and Method for Measuring Parameters Of A Mixture Having Liquid Droplets Suspended in A Vapor Flowing In A Pipe
7,340,353		3/4/08		A dual function flow measurement apparatus having an array of sensors
7,343,818		3/18/08		A clamp on apparatus and method for measuring gas volume fraction of a gluid flowing within a pipe
7,343,820		3/15/08		An apparatus and method for fiscal measuring of an aerated fluid
7,359,803		4/15/08		Apparatus and method for measuring parameters of a mixture having solid particles suspended in a fluid flowing in a pipe
7,363,800		4/29/08		Apparatus and method for measuring compositional parameters of a mixture
7,367,239		5/6/08		Piezocable based sensor for measuring unsteady pressures inside a pipe
7,367,240		5/6/08		An apparatus and method for providing a flow measurement compensated for entrained gas
7,369,716		5/6/08		High pressure and high temperature acoustic sensor
7,379,828		5/27/08		Method for determining a speed of sound quality metric for a flow meter having an array of sensors
7,380,438		6/3/08		Apparatus and method for providing a fluid cut measurement of a multi-liquid mixture compensated for entrained gas
7,380,439		6/3/08		An apparatus and method for compensating a coriolis meter
7,386,204		6/10/08		Optical filter having a shaped filter function
7,389,187		6/17/08		Apparatus and method using an array of ultrasonic sensors for determining the velocity of a fluid within a pipe
7,389,687		6/24/08		System for measuring a parameter of an aerated multi-phase mixture flowing in a pipe
7,400,985		7/15/08		An apparatus having an array of clamp on piezoelectric film sensors for measuring parameters of a process flow within a pipe
7,418,877		9/2/08		Wet gas metering using a differential pressure based flow meter with a sonar based flow meter
7,426,852		9/23/08		Submersible meter for measuring a parameter of gas hold-up of a fluid
7,430,881		10/7/08		Method of making an optical fiber attachment device
7,430,924		10/7/08		Flow measurement apparatus having strain-based sensors and ultrasonic sensors
7,437,043		10/14/08		Large diameter optical waveguide, grate and laser
7,437,946		10/21/08		An apparatus and method for measuring a parameter of a multiphase flow
7,440,873		10/21/08		An apparatus and method of processing data to improve the performance of a flow monitoring system
7,454,981		11/25/08		Apparatus and method for determining a parameter in a wet gas flow
7,463,828		12/9/08		Optical channel monitor
7,474,966		1/6/09		An apparatus having an array of piezoelectric film sensors for measuring parameters of a process flow within a pipe
7,503,227		3/17/09		Method and apparatus for measuring parameters of a fluid flow using an array of sensors
7,516,024		4/7/09		Method and apparatus for measuring parameters of a stratified flow
7,526,966		5/5/09		An apparatus and method for measuring a parameter of a multiphase flow
7,571,633		8/11/09		Measurement of entrained and dissolved gases in process flow lines
7,587,948		9/15/09		Flow Rate Measurement for industrial sensing applications using unsteady pressures
7,596,987		10/06/09		Apparatus and Method for Providing a Density Measurement Augmented for Entrained Gas
7,603,916		10/20/09		Wet Gas Metering using a Differential Pressure and a Sonar Based Flow Meter
7,617,716		11/17/09		Total Gas Meter Using Speed of Sound and Velocity Measurements
7,623,976		11/24/09		System of Distributed Configurable Flowmeters
7,624,650		12/01/09		Apparatus and Method for Attenuating Acoustic Waves Propagating within a Pipe Wall
7,624,651		12/01/09		Apparatus and Method for Attentuating Acoustic Waves in Pipe Walls for Clamp-On Ultrasonic Flow Meter
7,657,392		2/02/10		Method and Apparatus for Detecting and Characterizing Particles in a Multiphase Fluid
7,661,302		2/16/10		Multi-Phase Flow Measurement Ssytem having a Fluid Separator
7,672,794		3/02/10		System and Method for Operating a Flow Process
7,673,526		3/09/10		Method and Apparatus for Measuring a Paramter of a Fluid Flowing Within a Pipe Having a Sensing Device with Multiple Sensor Segments
7,690,266		4/06/10		Process Fluid Sound Speed Determined by Characterization of Acoustic Cross Modes
7,725,270		5/25/10		Industrial Flow Meter Having an Accessible Digital Interface
7,752,918		7/13/10		Apparatus and Method for Measuring a Fluid Flow Parameter within an Internal Passage of an Elongated Body
7,793,555		9/14/10		Apparatus and Method for Augmenting a Coriolis Meter
7,810,400		10/12/10		Velocity Based Method for Determining Air-fuel Ratio of a Fluid Flow
7,831,398		11/9/10		Method for Quantifying Varying Propagation Characteristics of Normal Incident Ultrasonic Signals as used in Correlation Based Flow Measurement
7,882,750		2/8/11		Method and Apparatus for Measuring Parameters of a Fluid Flowing within a Pipe Using a Configurable Array of Sensors
7,962,293		6/14/11		Apparatus and Method for Providing a Stratification Metric of a Multiphase Fluid Flowing within a Pipe
7,963,175		6/21/11		Clamp-On Apparatus for Measuring a Fluid Flow That Includes a Protective Sensor Housing
7,963,177		6/21/11		Apparatus for Attenuating Ultrasonic Waves Propagating within a Pipe Wall
7,795,559		7/14/11		Apparatus for Attenuating Ultrasonic Waves Propagating within a Pipe Wall
8,061,186		11/22/11		System and Method for Providing a Compositional Measurement of a Mixture Having Entrained Gas