Patent US4456902A successfully refreshed from Google Patents.
US4456902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas and humidity sensing element
Assignee: Mitsubishi Electric Corp
•
Filing: 1983-03-16
•
Granted: 1984-06-26
•
Expires: 2003-03-16
Abstract
Abstract A gas and humidity sensing element in a single integral structure made of a base plate of apatite ceramics, on which a particular metal oxide such as tin oxide, zinc oxide, or composite oxide of titanium and niobium is provided. The sensing element has a function of sensing gas and humidity with outstanding sensitivity to bad smell gas and alcoholic gas, in which the humidity is sensed and measured by variations in electrical resistance of the apatite ceramic base plate and the bad smell gas such as hydrogen sulfide, methyl mercaptan, etc. is sensed and measured by variations in electrical resistance of the metal oxide.
Inventors
- 👤 Yoshiharu Komine
- 👤 Takao Sawada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:16
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/121
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
A gas and humidity sensing element comprising: an element base plate consisting of apatite ceramics; first and second electrodes provided on said element base plate with said apatite ceramics being interposed therebetween; a third electrode provided on said element base plate with it being separated from said first and second electrodes; and a metal oxide provided between and in contact with said first and third electrodes, said metal oxide being at least one kind selected from the group consisting of tin oxide, zinc oxide, and composite oxide of titanium and niobium.
Claim 2
Dependent Claim
91 words
A gas and humidity sensing element comprising: an element base plate consisting of apatite ceramics; first and second electrodes provided on said element base plate with said apatite ceramics being interposed therebetween; a third electrode provided on said element base plate with it being separated from said first and second electrodes; and a metal oxide provided between and in contact with said first and third electrodes, said metal oxide being at least one kind selected from the group consisting of tin oxide, zinc oxide, and composite oxide of titanium and niobium.
Claim 3
Dependent Claim
19 words
The gas and humidity sensing element according to claim 1, wherein said metal oxide is doped with ruthenium oxide.
Claim 4
Dependent Claim
30 words
The gas and humidity sensing element according to claim 2, wherein said first and third electrodes consist of ruthenium oxide, which is printed and baked on said element base plate.
Claim 5
Dependent Claim
16 words
The gas and humidity sensing element according to claim 1, wherein said electrodes have porous surface.
Claim 6
Dependent Claim
30 words
The gas and humidity sensing element according to claim 1, wherein said first and third electrodes consist of ruthenium oxide, which is printed and baked onn said element base plate.
References Cited (Backward Citations)
US3705375A
Cited
US4015230A
Cited
US4052691A
Cited
JPS5456199A
Cited
EP0009825A1
Cited
JPS55165508A
Cited
US4359709A
Cited
US4328478A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |