Patent US504394A successfully refreshed from Google Patents.
Patent US3753191A successfully refreshed from Google Patents.
US3753191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low profile glass enclosed hermetically sealed circuit breaker
Assignee: GTE Sylvania Inc
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Filing: 1972-03-20
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Granted: 1973-08-14
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Expires: 1992-03-20
Abstract
Abstract A circuit breaker comprises a bimetal snap-action element disposed within a hermetically sealed glass envelope. The snapaction element opens an electrical circuit upon thermal or current overload. The glass envelope has two substantially flat parallel sides in order to provide a low profile to the circuit breaker and to improve thermal transfer to the snap-action element.
Inventors
- 👤 P Dennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:20
CPC Classifications
H; H01; H01H; H01H81/00; H01H81/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
176 words
A glass enclosed, hermetically sealed circuit breaker comprising: a glass envelope having a flattened elliptical shape, the flattened sides thereof being sUbstantially parallel to each other; a press seal at one end of said envelope; two spaced apart lead-in wires embedded in said press seal extending interiorly and exteriorly therefrom; a substantially flat bimetal snapaction element disposed within said envelope and mounted on the upper end of one of said lead-in wires, said element being substantially parallel to said flattened sides of said envelope; a first contact button centrally disposed on the upper end of said element; a second contact button mounted on the upper end of the other of said lead-in wires, said buttons normally being in physical and electrical contact with each other; and said element having a predetermined snapping temperature whereby, upon attainment of said temperature, said element snaps open and interrupts an electrical circuit, the gap between said element and the proximate flattened side of said envelope being small so that the envelope limits the travel of said element upon opening thereof.
Claim 2
Dependent Claim
176 words
A glass enclosed, hermetically sealed circuit breaker comprising: a glass envelope having a flattened elliptical shape, the flattened sides thereof being sUbstantially parallel to each other; a press seal at one end of said envelope; two spaced apart lead-in wires embedded in said press seal extending interiorly and exteriorly therefrom; a substantially flat bimetal snapaction element disposed within said envelope and mounted on the upper end of one of said lead-in wires, said element being substantially parallel to said flattened sides of said envelope; a first contact button centrally disposed on the upper end of said element; a second contact button mounted on the upper end of the other of said lead-in wires, said buttons normally being in physical and electrical contact with each other; and said element having a predetermined snapping temperature whereby, upon attainment of said temperature, said element snaps open and interrupts an electrical circuit, the gap between said element and the proximate flattened side of said envelope being small so that the envelope limits the travel of said element upon opening thereof.
Claim 3
Dependent Claim
29 words
The circuit breaker of claim 1 wherein the distance between the flattened sides of said envelope is less than the distance between the curved sides of said elliptical shape.
Claim 4
Dependent Claim
26 words
The circuit breaker of claim 2 wherein the gap between said element and the proximate flattened side of said envelope is about 30 to 60 mils.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |