| US 7,479,255 B2 | ||
| Gas sensor | ||
| Seiichi Otani, Tokyo (Japan); Yukio Nakamura, Tokyo (Japan); and Mamoru Furusato, Tokyo (Japan) | ||
| Assigned to Riken Keiki Co., Ltd., Tokyo (Japan) | ||
| Appl. No. 10/495,790 PCT Filed Nov. 14, 2002, PCT No. PCT/JP02/11875 § 371(c)(1), (2), (4) Date Nov. 01, 2004, PCT Pub. No. WO03/042678, PCT Pub. Date May 22, 2003. |
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| Claims priority of application No. 2001-350021 (JP), filed on Nov. 15, 2001; application No. 2002-295794 (JP), filed on Oct. 09, 2002; and application No. 2002-295795 (JP), filed on Oct. 09, 2002. | ||
| Prior Publication US 2005/0042141 A1, Feb. 24, 2005 | ||
| Int. Cl. G01N 31/12 (2006.01); G01N 27/16 (2006.01) | ||
| U.S. Cl. 422—94 [422/95; 422/96; 422/97; 436/144; 436/159] | 15 Claims |
| 1. A gas sensor comprising:
a gas-sensing element comprising a catalyst;
a temperature-compensating element;
a case holding said elements;
a chip-type resistor heater disposed between a specimen gas intake of the case and the gas-sensing and temperature-compensating
elements; and
a water-repelling filter disposed at the specimen gas intake of the case; wherein the concentration of a specimen gas is determined
from the difference in electrical resistance between the gas-sensing element and the temperature-compensating element.
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