US3961248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas detector using gas sensing elements exhibiting different response characteristics
Assignee: Nohmi Bosai Ltd
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Filing: 1974-07-02
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Granted: 1976-06-01
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Expires: 1994-07-02
Abstract
Abstract A gas detector comprises a plurality of semiconductor gas detector elements each exhibiting a different sensitivity for at least one gaseous conponent. The elements are electrically combined in an electrical circuit to provide an output indicating the existence of a particular gas in an atmosphere.
Inventors
- 👤 Masanori Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:51
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027; G01N33/0031
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
A gas detector comprising: a pair of input terminals; a pair of output terminals; and an electrical circuit comprised of a plurality of gas sensing elements serially connected across said input terminals through a resistor connected across said output terminals, said gas sensing elements each having a different sensitivity for at least one of the gaseous components to be detected.
Claim 2
Dependent Claim
60 words
A gas detector comprising: a pair of input terminals; a pair of output terminals; and an electrical circuit comprised of a plurality of gas sensing elements serially connected across said input terminals through a resistor connected across said output terminals, said gas sensing elements each having a different sensitivity for at least one of the gaseous components to be detected.
Claim 3
Dependent Claim
23 words
A gas detector as claimed in claim 1, wherein one of said gas sensing elements has a pair of output terminals connected thereacross.
Claim 4
Dependent Claim
24 words
A gas detector as claimed in claim 1, wherein one of said gas sensing elements has another gas sensing element connected in parallel thereto.
Claim 5
Dependent Claim
80 words
A gas detector comprising: a pair of input terminals; a pair of output terminals; and an electrical circuit comprised of a plurality of gas sensing elements connected in series with one another across said input terminals, said gas sensing elements each having a different sensitivity for at least one of the gaseous components to be detected, and one of said gas sensing elements having a pair of output terminals connected thereacross and another gas sensing element connected in parallel thereto.
Claim 6
Dependent Claim
80 words
A gas detector comprising: a pair of input terminals; a pair of output terminals; and an electrical circuit comprised of a plurality of gas sensing elements connected in series with one another across said input terminals, said gas sensing elements each having a different sensitivity for at least one of the gaseous components to be detected, and one of said gas sensing elements having a pair of output terminals connected thereacross and another gas sensing element connected in parallel thereto.
Claim 7
Dependent Claim
84 words
A gas detector comprising a pair of input terminals, a pair of output terminals, and a parallel connection circuit connected across said input terminals through a resistor connected across said output terminals, said parallel connection circuit comprising two gas sensing elements each having a different sensitivity for at least one of gaseous components to be detected and connectdd in parallel with each other, and two diodes each connected in series with one of said gas sensing elements and poled in reverse direction each other.
Claim 8
Dependent Claim
84 words
A gas detector comprising a pair of input terminals, a pair of output terminals, and a parallel connection circuit connected across said input terminals through a resistor connected across said output terminals, said parallel connection circuit comprising two gas sensing elements each having a different sensitivity for at least one of gaseous components to be detected and connectdd in parallel with each other, and two diodes each connected in series with one of said gas sensing elements and poled in reverse direction each other.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |