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Class Information
Number: 356/439
Name: Optics: measuring and testing > For light transmission or absorption > Of fluent material > Gas > Exhaust, dust or smoke > Contained
Description: Subject matter wherein there is structure to enclose, at least partially, a gas which has entrained dust or smoke particles.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7435391 |
Light-mediated micro-chemical reactors |
Oct. 14, 2008 |
| 7400407 |
Meter for measuring the turbidity of fluids using reflected light |
Jul. 15, 2008 |
| 7382459 |
Spectroscopic gas sensor, in particular for detecting at least one gas component in the ambient air, and method for manufacturing a spectroscopic gas sensor of this type |
Jun. 3, 2008 |
| 7354553 |
Method and apparatus for detecting the presence of elemental mercury in a gas sample |
Apr. 8, 2008 |
| 7352464 |
Oxygen sensor for aircraft fuel inerting systems |
Apr. 1, 2008 |
| 7283243 |
Semiconductor diode laser spectrometer arrangement and method |
Oct. 16, 2007 |
| 7227642 |
Absorbance monitor |
Jun. 5, 2007 |
| 7112447 |
Hand held gas analyzer |
Sep. 26, 2006 |
| 7095501 |
Ethyl alcohol sensor and method of use |
Aug. 22, 2006 |
| 7057175 |
Infrared absorption measurement method, infrared absorption measurement device, and method of manufacturing semiconductor device |
Jun. 6, 2006 |
| 7016039 |
Purging light beam paths in optical equipment |
Mar. 21, 2006 |
| 6989549 |
Optical gas sensor |
Jan. 24, 2006 |
| 6943886 |
Method for enhanced gas monitoring in high particle density flow streams |
Sep. 13, 2005 |
| 6885453 |
Gas permeable probe for use in an optical analyzer for an exhaust gas stream flowing through a duct or chimney |
Apr. 26, 2005 |
| 6809825 |
Gas permeable probe for use in an optical analyzer for an exhaust gas stream flowing through a duct or chimney |
Oct. 26, 2004 |
| 6756906 |
Self-diagnostic smoke detector |
Jun. 29, 2004 |
| 6755074 |
Liquid chromatographic method and system |
Jun. 29, 2004 |
| 6753967 |
Gas sensor |
Jun. 22, 2004 |
| 6507013 |
Optical reference element and procedure for the spectral calibration of an optical spectrum analyzer |
Jan. 14, 2003 |
| 6377348 |
Smoke chamber for evaluating foundry sand shapes and its method of use |
Apr. 23, 2002 |
| 6351999 |
Vortex flow sensor |
Mar. 5, 2002 |
| 6108072 |
Protection for optical sensors in industrial applications |
Aug. 22, 2000 |
| 6067167 |
ILS sensors for drug detection within vehicles |
May. 23, 2000 |
| 6050656 |
Optical based opacity and flow monitoring system and method of monitoring opacity and flow |
Apr. 18, 2000 |
| 5993743 |
Hand-held vehicle exhaust analyzer |
Nov. 30, 1999 |
| 5943136 |
Intra-cavity total reflection for high sensitivity measurement of optical properties |
Aug. 24, 1999 |
| 5907407 |
ILS sensors for alcohol detection within vehicles |
May. 25, 1999 |
| 5854685 |
Holographic gas analyzer utilizing holographic optics |
Dec. 29, 1998 |
| 5852398 |
Apparatus for indicating failure of an air filtration system in a diesel engine |
Dec. 22, 1998 |
| 5844668 |
Protection window for optical sensors in industrial applications |
Dec. 1, 1998 |
| 5835230 |
Method for calibration of a spectroscopic sensor |
Nov. 10, 1998 |
| 5831730 |
Method for monitoring particulates using beam-steered solid-state light source |
Nov. 3, 1998 |
| 5751424 |
Scalable non-contact optical backscatter insertion probe |
May. 12, 1998 |
| 5742054 |
Ultra-sensitive detection of contaminants in corrosive gas via intracavity laser spectroscopy (ILS) |
Apr. 21, 1998 |
| 5696592 |
Immersible apparatus for measuring light penetrability of liquids |
Dec. 9, 1997 |
| 5694208 |
Sensor for detecting fine particles such as smoke or dust contained in the air |
Dec. 2, 1997 |
| 5621213 |
System and method for monitoring a stack gas |
Apr. 15, 1997 |
| 5600444 |
Detecting analyte light absorption utilizing degenerate four wave mixing |
Feb. 4, 1997 |
| 5528040 |
Ring-down cavity spectroscopy cell using continuous wave excitation for trace species detection |
Jun. 18, 1996 |
| 5502434 |
Smoke sensor |
Mar. 26, 1996 |
| 5452234 |
Process environment monitoring system |
Sep. 19, 1995 |
| 5424842 |
Self-cleaning system for monitoring the opacity of combustion engine exhaust using venturi effect |
Jun. 13, 1995 |
| 5418616 |
Method and apparatus for optically detecting the dimensions of an object and use of the method |
May. 23, 1995 |
| 5418366 |
IR-based nitric oxide sensor having water vapor compensation |
May. 23, 1995 |
| 5404228 |
Misalignment detection apparatus for transmissiometer with underfilled reflector |
Apr. 4, 1995 |
| 5402242 |
Method of and an apparatus for measuring a concentration of a fluid |
Mar. 28, 1995 |
| 5374992 |
Exhaust gas particle sensor |
Dec. 20, 1994 |
| 5363199 |
Smoke opacity detector |
Nov. 8, 1994 |
| 5353629 |
Smoke meter |
Oct. 11, 1994 |
| 5241367 |
Device for measuring the composition of fluids, in particular the components of exhaust gases from internal combustion engines |
Aug. 31, 1993 |
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