Gas sensor
US6548023B1 · kind B1 · utility
8Cited by
21References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1999 |
| Grant date | Apr 15, 2003 |
| Priority date | — |
| Expiry date | Jun 17, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/407
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a gas sensor, a casing which accommodates a sensing element includes an inner cylindrical member and an outer cylindrical member which are caulked together by means of a caulked portion. The Vickers hardness H1 of the inner cylindrical member is Hv 250 to 430; the Vickers hardness H2 of the outer cylindrical member is Hv 160 to 330; and the hardness difference “H1-H2” is not less than 30. Through employment of the above ranges of H1 and H2, the caulked portion can maintain good airtightness even in a working environment involving, for example, thermal shocks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.