US3727164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature-responsive electrical switch
Assignee: Elmwood Sensors Inc
•
Filing: 1972-07-14
•
Granted: 1973-04-10
•
Expires: 1992-07-14
Abstract
Abstract An improved, temperature-responsive electrical switch is provided which is actuated at temperatures above 250* C., the switch utilizing fusible pellets prepared from imide or substituted melamine compounds.
Inventors
- 👤 M Cartier
- 👤 G Groff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:24
CPC Classifications
H; H01; H01H; H01H37/00; H01H37/74; H01H37/76; H01H37/764; H01H37/765; H01H2037/769
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
31 words
The improvement of claim 1 wherein said temperature-resistant casing comprises a copper or brass shell bearing a first thin overcoating of nickel and a second thin overcoating of silver or gold.
Claim 2
Dependent Claim
26 words
The improvement of claim 2 wherein said casing comprises a brass shell bearing a first thin overcoating of nickel and a second thin overcoating of silver.
Claim 3
Dependent Claim
11 words
The improvement of claim 1 wherein said fusible pellet comprises hexaphenylmelamine.
Claim 4
Dependent Claim
31 words
The improvement of claim 1 wherein said fusible pellet is prepared from a compound selected from the group consisting of diphthalimidodiphenylsulfone, diphthalimidodiphenyl ether, and the imide prepared from benzophenonedianhydride and o-toluidine.
Claim 5
Dependent Claim
13 words
The improvement of claim 1 wherein said resin comprises a cured silicone resin.
Claim 6
Dependent Claim
26 words
The improvement of claim 1 wherein said surface of said second conductor bears a first thin overcoating of nickel and a second thin overcoating of rhodium.
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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |