US4131868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Incandescent lamp socket having overtemperature protector
Assignee: GTE Sylvania Inc
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Filing: 1977-03-07
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Granted: 1978-12-26
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Expires: 1997-03-07
Abstract
Abstract A socket for an electric lamp contains a thermal protector to shut off current flow to the lamp when the socket is heated above a predetermined temperature.
Inventors
- 👤 Joseph A. Dombrowski
- 👤 Clement T. Baxter
- 👤 Frederick B. Howard
- 👤 George H. Simpson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:31
CPC Classifications
H; H01; H01R; H01R33/00; H01R33/945; H01R33/95
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
97 words
A socket for an electric lamp comprising an insulative housing containing a threaded metal shell for screwing a lamp base thereinto, a spring metal contact within said housing for making contact with the center contact of the lamp base, means for supplying electric current to said threaded metal shell and said spring metal contact, and a thermal protector within said housing to interrupt the electric current when the socket becomes heated above a predetermined temperature, wherein said thermal protector is normally closed at the normal operating temperature of the socket but opens at a predetermined higher temperature.
Claim 2
Dependent Claim
97 words
A socket for an electric lamp comprising an insulative housing containing a threaded metal shell for screwing a lamp base thereinto, a spring metal contact within said housing for making contact with the center contact of the lamp base, means for supplying electric current to said threaded metal shell and said spring metal contact, and a thermal protector within said housing to interrupt the electric current when the socket becomes heated above a predetermined temperature, wherein said thermal protector is normally closed at the normal operating temperature of the socket but opens at a predetermined higher temperature.
Claim 3
Dependent Claim
13 words
The socket of claim 1 wherein said thermal protector comprises a bimetal blade.
Claim 4
Dependent Claim
31 words
The socket of claim 2 including an insulator between the bimetal blade and the spring metal contact to prevent said blade from touching said spring metal contact when said blade opens.
Claim 5
Dependent Claim
32 words
The socket of claim 2 wherein said housing has a shelf therewithin to which is fastened a metal strap that is electrically disposed between the spring metal contact and the bimetal blade.
Claim 6
Dependent Claim
27 words
The socket of claim 4 wherein said shelf has a calibration hole therethrough by means of which the opening temperature of the bimetal blade may be adjusted.
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) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |