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Class Information
Number: 250/231.19
Name: Radiant energy > Photocells; circuits and apparatus > Optical or pre-photocell system > Light valve (e.g., iris diaphragm) > Actuated by dynamic external physical quantity > Pressure-responsive light valves
Description: Subject matter under 231.1 wherein the dynamic external mechanical force sensed is pressure ((P) = F/A where F = a Newtonian type force and A = Area over which the force is applied) applied to the means in the optical path for varying the amount of light to reach the photocell(s).
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7399954 |
System and method for an optical navigation device configured to generate navigation information through an optically transparent layer and to have skating functionality |
Jul. 15, 2008 |
| 7266261 |
Fiber optics differential pressure transducer |
Sep. 4, 2007 |
| 7104135 |
Optical pressure-sensing system and method for sensing pressure |
Sep. 12, 2006 |
| 6758086 |
Automotive cylinder pressure sensors |
Jul. 6, 2004 |
| 6619134 |
Measuring device for measuring small forces and displacements |
Sep. 16, 2003 |
| 6462329 |
Fiber bragg grating reference sensor for precise reference temperature measurement |
Oct. 8, 2002 |
| 6450037 |
Non-intrusive fiber optic pressure sensor for measuring unsteady pressures within a pipe |
Sep. 17, 2002 |
| 6422084 |
Bragg grating pressure sensor |
Jul. 23, 2002 |
| 6397745 |
Method and apparatus for maintaining ink level in ink fountain of printing press |
Jun. 4, 2002 |
| 6341526 |
Micromachined diffractive pressure sensor system |
Jan. 29, 2002 |
| 6321603 |
Pressure sensor |
Nov. 27, 2001 |
| 6222184 |
Device for measuring the surface pressure |
Apr. 24, 2001 |
| 6122971 |
Integrated fiber optic combustion pressure sensor |
Sep. 26, 2000 |
| 6038926 |
TDM array of optical non-acoustic pressure sensors |
Mar. 21, 2000 |
| 6016703 |
Noninvasive load and pressure sensor system utilizing the principle of refraction of light through a compressible fluid |
Jan. 25, 2000 |
| 5983725 |
Tactile pressure sensor |
Nov. 16, 1999 |
| 5969838 |
System for attenuation of noise |
Oct. 19, 1999 |
| 5965880 |
Tactile opto-electronic pressure sensor |
Oct. 12, 1999 |
| 5925879 |
Oil and gas well packer having fiber optic Bragg Grating sensors for downhole insitu inflation monitoring |
Jul. 20, 1999 |
| 5908988 |
Optical vacuum pressure gauge |
Jun. 1, 1999 |
| 5619046 |
Method of manufacturing a measuring device |
Apr. 8, 1997 |
| 5604318 |
Optical pressure detector |
Feb. 18, 1997 |
| 5532479 |
Temperature, pressure, vibration or humidity sensor based on reflected light from a bimetallic, plastic or dehumidifying material |
Jul. 2, 1996 |
| 5517022 |
Apparatus for measuring an ambient isotropic parameter applied to a highly birefringent sensing fiber using interference pattern detection |
May. 14, 1996 |
| 5488224 |
System for characterizing flow pattern, pressure and movement of a fluid |
Jan. 30, 1996 |
| 5481919 |
Force multiplying pressure transmitter diaphragm and method employing flexible force transmitting column |
Jan. 9, 1996 |
| 5446279 |
Fiber optic sensor sensing curvature of a diaphragm |
Aug. 29, 1995 |
| 5425273 |
Fiber optic pressure sensor with inclusions in a compressible transparent material |
Jun. 20, 1995 |
| 5422478 |
Fiberoptic pressure sensor having drift correction means for insitu calibration |
Jun. 6, 1995 |
| 5390546 |
Fiber optic diaphragm sensors for engine knock and misfire detection |
Feb. 21, 1995 |
| 5387792 |
Optical frequency encoding for normal shock and position sensing |
Feb. 7, 1995 |
| 5386729 |
Temperature compensated microbend fiber optic differential pressure transducer |
Feb. 7, 1995 |
| 5385053 |
Fiber optic pressure sensor systems |
Jan. 31, 1995 |
| 5381005 |
Optical fiber stress detector using amplitude modulation |
Jan. 10, 1995 |
| 5367583 |
Fiber optic stress-corrosion sensor and system |
Nov. 22, 1994 |
| 5357804 |
Device including a planar matrix of fluid filled bags for measuring pressure acting on a support |
Oct. 25, 1994 |
| 5351547 |
Optical pressure transducer having a fixed reflector and a movable reflector attached to a diaphragm |
Oct. 4, 1994 |
| 5326969 |
System for characterizing flow pattern and pressure of a fluid |
Jul. 5, 1994 |
| 5325865 |
Intracranial pressure monitoring system |
Jul. 5, 1994 |
| 5324956 |
System for characterizing movement and temperature of fluids |
Jun. 28, 1994 |
| 5319978 |
Optical pressure transducer |
Jun. 14, 1994 |
| 5317948 |
Pressure transducer using permanent magnet and opposing variable magnetic field |
Jun. 7, 1994 |
| 5317147 |
Method and apparatus for absolute measurement of force by use of polarized, non-coherent light and compensation of strain-induced birefringence effects in a single mode-fiber optic waveguide |
May. 31, 1994 |
| 5315110 |
Metal cup pressure transducer with a support having a plurality of thermal expansion coefficients |
May. 24, 1994 |
| 5309767 |
Pressure sensor using liquid crystals |
May. 10, 1994 |
| 5297437 |
Device for manometric measurement of the esophagus |
Mar. 29, 1994 |
| 5289720 |
Optic sensor for determining environmental conditions |
Mar. 1, 1994 |
| 5283430 |
Optical frequency encoding for normal shock and position sensing having a broadband light source and a color gradient filter |
Feb. 1, 1994 |
| 5272333 |
System for characterizing pressure, movement, and temperature of fluids |
Dec. 21, 1993 |
| 5262641 |
Compensation mechanism for a pressure sensor having counterweight mechanism |
Nov. 16, 1993 |
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