Patent US3573697A successfully refreshed from Google Patents.
US3573697A
Expired / Lapsed
US
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Hermetically sealed circuit breaker
Assignee: GTE Sylvania Inc
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Filing: 1968-09-13
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Granted: 1971-04-06
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Expires: 1988-09-13
Abstract
Abstract A circuit breaker having high amperage capacity includes a metallic snap-action element, capable of opening an electrical circuit upon thermal or current overload, disposed within a sealed glass envelope. Two metallic tubes are sealed to, and pass through, one end of the envelope. Lead-in conductors, which also serve as supporting members for the breaker assembly, extend through, and are sealed to, the metallic tubes.
Inventors
- 👤 Philip J Dennis
- 👤 Paul E Gates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:02
CPC Classifications
H; H01; H01H; H01H37/00; H01H37/02; H01H37/32; H01H37/52; H01H37/54; H01H37/5418
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
A circuit breaker comprising: a hermetically sealed glass envelope; two spaced-apart metal tubes sealed to one end of said envelope and extending internally and externally of said envelope, said metal tubes being readily sealable to glass; a metal lead-in wire disposed within each of said metal tubes and being hermetically joined thereto and extending beyond the ends thereof, the metal of said lead-in wire having greater electrical conductivity than the metal comprising said metal tubes; and a thermostatic snap acting metallic element disposed within said envelope and being affixed to the first of said lead-in wires at a point intermediate the internal end thereof and said end of said envelope, said element normally being in electrical contact with the second of said lead-in wires.
Claim 2
Dependent Claim
124 words
A circuit breaker comprising: a hermetically sealed glass envelope; two spaced-apart metal tubes sealed to one end of said envelope and extending internally and externally of said envelope, said metal tubes being readily sealable to glass; a metal lead-in wire disposed within each of said metal tubes and being hermetically joined thereto and extending beyond the ends thereof, the metal of said lead-in wire having greater electrical conductivity than the metal comprising said metal tubes; and a thermostatic snap acting metallic element disposed within said envelope and being affixed to the first of said lead-in wires at a point intermediate the internal end thereof and said end of said envelope, said element normally being in electrical contact with the second of said lead-in wires.
Claim 3
Dependent Claim
26 words
The circuit breaker of claim 1 comprising, in addition, a flat metallic shunt disposed substantially parallely on said element and joined thereto at the ends thereof.
Claim 4
Dependent Claim
22 words
The circuit breaker of claim 1 wherein said first lead-in wire has an undercut at the point of affixation to said element.
Claim 5
Dependent Claim
38 words
The circuit breaker of claim 1 wherein said first lead-in wire has an undercut at the point of affixation to said element and comprising, in addition, a metal tab welded to said element at said point of affixation.
Claim 6
Dependent Claim
32 words
The circuit breaker of claim 1 wherein the upper end of said first lead-in wire is closely spaced from the movable end of said element and is a mechanical arc-suppressing stop therefor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |