US4322383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas component detection apparatus
Assignee: Toyota Motor Corp
•
Filing: 1980-08-18
•
Granted: 1982-03-30
•
Expires: 2000-08-18
Abstract
Abstract A gas component detection apparatus comprises a first and a second gas sensing elements each composed of a metal oxide which exhibits variable electric resistances according to gaseous components and temperatures of gases to be detected. A catalyst is carried at least by the first sensing element for promoting oxidation reactions of the gaseous components of the gases. A first pair of electrodes are inserted into those portions of the first sensing element which are subjected to catalytic action of the catalyst. Into the portions of the second sensing element which are not subjected to catalytic action are inserted a second pair of electrodes. The first pair of electrodes sense a variation in electric resistances resulting from the gaseous components and temperatures of the gases, while the second pair of electrodes detect an electric resistance variation related mainly upon the gas temperatures. Consequently, an output signal reflecting substantially only the gaseous components of the gases is produced by offsetting both of the electric resistances separately sensed utilizing a suitable electric circuit.
Inventors
- 👤 Eturo Yasuda
- 👤 Susumu Sato
- 👤 Yoshihiro Segawa
- 👤 Tadashi Hattori
- 👤 Keiji Aoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:40
CPC Classifications
H; H01; H01C; H01C13/00; G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/14; G01N27/16; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027; G01N33/0031
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
192 words
A gas component detection apparatus comprising: first and second gas sensing elements each including a metal oxide which exhibits variable electric resistance according to gaseous components and temperatures of gases to be detected, each element additionally carrying a catalyst for promoting oxidation reactions of the gaseous components of the gases, a first pair of electrodes inserted into said first sensing element for sensing a variation in electric resistance exhibited at a portion of said first sensing element subjected to catalytic action of the catalyst carried thereon, a second pair of electrodes inserted into said second sensing element for sensing a variation in electric resistance exhibited at a portion of said second sensing element at which the electric resistance sensed across the second pair of electrodes is not affected by the catalytic action of the catalyst carried thereon, and circuit means adapted to be joined to said pairs of electrodes for producing an output signal in a manner whereby the variations in resistance of the sensing elements resulting from gas temperatures offset one another and said output is representative of variations in resistance of the first sensing element resulting from the gaseous components.
Claim 2
Dependent Claim
192 words
A gas component detection apparatus comprising: first and second gas sensing elements each including a metal oxide which exhibits variable electric resistance according to gaseous components and temperatures of gases to be detected, each element additionally carrying a catalyst for promoting oxidation reactions of the gaseous components of the gases, a first pair of electrodes inserted into said first sensing element for sensing a variation in electric resistance exhibited at a portion of said first sensing element subjected to catalytic action of the catalyst carried thereon, a second pair of electrodes inserted into said second sensing element for sensing a variation in electric resistance exhibited at a portion of said second sensing element at which the electric resistance sensed across the second pair of electrodes is not affected by the catalytic action of the catalyst carried thereon, and circuit means adapted to be joined to said pairs of electrodes for producing an output signal in a manner whereby the variations in resistance of the sensing elements resulting from gas temperatures offset one another and said output is representative of variations in resistance of the first sensing element resulting from the gaseous components.
Claim 3
Dependent Claim
41 words
A gas component detection apparatus as set forth in claim 1, wherein the metal oxide of each of said first and second sensing elements includes a plurality of different metal oxides exhibiting substantially same resistance variation for the same temperature variation.
Claim 4
Dependent Claim
31 words
A gas component detection apparatus as set forth in claim 1 or 2, wherein said first sensing element has a porous structure, while said second sensing element has a dense structure.
Claim 5
Dependent Claim
19 words
A gas component detection apparatus as set forth in claim 3, wherein said second sensing element includes chromium oxide.
Claim 6
Dependent Claim
19 words
A gas component detection apparatus as set forth in claim 3, wherein said second sensing element includes manganese oxides.
Claim 7
Dependent Claim
34 words
A gas component detection apparatus as set forth in claim 1 wherein said second sensing element carries said catalyst in a region spaced apart from at least one of said second pair of electrodes.
Claim 8
Dependent Claim
25 words
A gas component detection apparatus as set forth in claim 6, wherein said region is spaced apart from both of said second pair of electrodes.
Claim 9
Dependent Claim
43 words
A gas component detection apparatus as set forth in claim 6, wherein the region in which said catalyst is carried is adjacent a surface of the second sensing element, a portion of one of said second pair of electrodes extending within said region.
Claim 10
Dependent Claim
34 words
A gas component detection apparatus as set forth in claim 6, wherein the region in which said catalyst is carried surrounds one of the second pair of electrodes inserted within said second sensing element.
References Cited (Backward Citations)
US3092799A
Cited
US3479257A
Cited
US3695848A
Cited
US3699803A
Cited
US3732519A
Cited
US3893230A
Cited
US3901067A
Cited
DE2636178A1
Cited
US4099922A
Cited
US4151503A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-29 | 1985-09-28 | 1986-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-29 | 1989-09-28 | 1990-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-29 | 1993-09-28 | 1994-03-30 | $7700.00 | Window Closed / Lapsed |