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| Number | Title | Issue Date |
| 5502308 | Diffusion-type gas sample chamber Apparatus for measuring the concentration of a gas present in a sample chamber by ambient pressure diffusion employs a nondispersive infrared gas analysis technique. The sample chamber has the form of a tube that is closed at one end, with a source of rad... | 03/26/1996 |
| 5453621 | Enhanced pathlength gas sample chamber The sensitivity of a nondispersive infrared gas analyzer increases with increasing pathlength, which increases the absorption of the infrared radiation by the gas whose concentration is to be determined. The present invention includes the addition of an o... | 09/26/1995 |
| 5414264 | Enhanced pathlength gas sample chamber The sensitivity of a nondispersive infrared gas analyzer increases with increasing pathlength, which increases the absorption of the infrared radiation by the gas whose concentration is to be determined. The present invention includes the addition of an o... | 05/09/1995 |
| 5384640 | Gas sample chamber for use with a source of coherent radiation A gas sample chamber that is particularly advantageous for use with a semiconductor laser has the form of an elongated hollow tube with a specularly reflective inside surface, a semiconductor laser located at one end of the tube and a detector located at ... | 01/24/1995 |
| 5369397 | Adaptive fire detector The fire detector includes a carbon dioxide sensor and a microcomputer. When the rate of increase of the concentration of carbon dioxide at the sensor exceeds a threshold, an alarm is produced. The threshold is set at one of three possible levels by the m... | 11/29/1994 |
| 5341214 | NDIR gas analysis using spectral ratioing technique An instrument for determining the concentration of a particular gas that might be present in a sample has no moving parts and is extremely compact and inexpensive. A novel waveguiding structure serves both as an optical element and as the sample chamber. ... | 08/23/1994 |
| 5340986 | Diffusion-type gas sample chamber The improved sample chamber includes an elongated hollow tube closed at one end and having specularly-reflective inwardly facing surfaces. A source of radiation and a detector of radiation are mounted side by side in the open end of the hollow tube, both ... | 08/23/1994 |
| 5335534 | Functional testing method for toxic gas sensors The proper operation of an NDIR toxic gas sensor can be checked by using a non-toxic gas that has an absorption band that overlaps the absorption band used for measuring the toxic gas. The NDIR sensor cannot distinguish which of the two gases is responsib... | 08/09/1994 |
| 5222389 | Multi-channel gas sample chamber A gas sample chamber for use in a gas analyzer consists of an elongated hollow tube having an inwardly-facing specularly-reflective surface that permits the tube to function also as a light pipe for conducting radiation from a source to a detector through... | 06/29/1993 |
| 5215498 | Ventilation controller An affordable ventilation controller comprises a low cost and very stable carbon dioxide sensor and a remote-controlled louvered suction fan equipped with an air filter. The ventilation controller operates independently of any existing heating or cooling ... | 06/01/1993 |
| 5163332 | Gas sample chamber A diffusion-type gas sample chamber for use in a gas analyzer consists of an elongated hollow tube having an inwardly-facing specularly-reflective surface that permits the tube to function also as a light pipe for transmitting radiation from a source to a... | 11/17/1992 |
