US3603954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas alarm device
Assignee: New Cosmos Electric Co Ltd
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Filing: 1970-02-12
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Granted: 1971-09-07
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Expires: 1990-02-12
Abstract
Abstract A detecting element for inflammable gases which includes a pair of electrodes formed of a relatively nonoxidizable material which are supported in spaced relationship by an intervening member having parallel grooves for receiving the coils and to which the coils are fixed at least in part and a metal oxide semiconductor covering said electrodes and intervening member.
Inventors
- 👤 Tutaharu Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:17
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G08; G08B; G08B17/00; G08B17/10; G08B17/117
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
89 words
An inflammable gas detector comprising a pair of coiled electrodes formed of a metal that is relatively stable at high temperatures, a body of heatproof electrically insulating material having a pair of opposing edges thereon, means securing a portion of the periphery of each electrode to one of said opposing edges and a metal oxide semiconductor enclosing said body and electrodes with the ends of said electrodes extending therefrom, the resistance of said semiconductor when at a high temperature changing in value in the presence of an inflammable gas.
Claim 2
Dependent Claim
89 words
An inflammable gas detector comprising a pair of coiled electrodes formed of a metal that is relatively stable at high temperatures, a body of heatproof electrically insulating material having a pair of opposing edges thereon, means securing a portion of the periphery of each electrode to one of said opposing edges and a metal oxide semiconductor enclosing said body and electrodes with the ends of said electrodes extending therefrom, the resistance of said semiconductor when at a high temperature changing in value in the presence of an inflammable gas.
Claim 3
Dependent Claim
39 words
An inflammable gas detector according to claim 1 wherein said opposing edges of said body having cylindrical concave grooves and portions of the peripheries of said electrodes are secured in said grooves by a high melting point bonding agent.
Claim 4
Dependent Claim
32 words
An inflammable gas detector according to claim 3 including a stem of insulating material and supports carried by said stem, and wherein the ends of said electrodes are secured to said support.
Claim 5
Dependent Claim
24 words
An inflammable gas detector according to claim 3 including a metal mesh surrounding at least part of said element and secured to said stem.
Claim 6
Dependent Claim
56 words
An inflammable gas detector according to claim 1 including a transformer having at least one winding with terminals at the ends thereof and a voltage tap, means connecting one electrode to one terminal and the tap to energize said electrode and means Including a buzzer connecting the other electrode to the other terminal of said winding.
Claim 7
Dependent Claim
73 words
An inflammable gas detector according to claim 5 wherein said buzzer comprises a pole piece, a coil surrounding said pole piece, a yoke of magnetic material magnetically coupled to one end of said pole piece, a diaphragm secured at one end to said yoke and extending in spaced overlying relationship to the other end of said pole piece and means engaging said diaphragm to modify the spacing between it and said pole piece.
Claim 8
Dependent Claim
65 words
An inflammable gas detector according to claim 5 including a housing enclosing said element, transformer and buzzer, said housing including an opening for admission of air to said metal oxide semiconductor enclosing said electrodes and a skirtlike wall surrounding said housing and in spaced relationship thereto, said wall forming with said housing a resonant chamber for increasing the level of sound produced by said buzzer.
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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |