US3249810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit interrupting apparatus
Assignee: Westinghouse Electric Corp
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Filing: 1962-11-20
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Granted: 1966-05-03
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Expires: 1982-11-20
Abstract
No abstract record available.
Inventors
- 👤 Albert P Strom
- 👤 Jr Thomas E Browne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:58
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; H01H; H01H33/00; H01H33/02; H01H33/04; H01H33/16; H01H33/161; H01H9/00; H01H9/54; H03; H03K; H03K17/00; H01H2033/163
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A CIRCUIT INTERRUPTER COMPRISING, FIRST SWITCHING MEANS, THERMISTOR MEANS COMPRISING MATERIAL HAVING A POSITIVE TEMPERATURE COEFFICIENT WHOSE RESISTIVITY INCREASES RAPIDILY WITH TEMPERATURE CONNECTED ACROSS SAID FIRST SWITCH MEANS, VOLTAGE SENSITIVE MEANS HAVING A RESISTANCE WHICH DECREASES WITH VOLTAGE CONNECTED ACROSS SAID THERMISTOR MEANS, SECOND SWITCHING MEANS OPERATIVELY CONNECTED IN SERIES WITH SAID THERMISTOR MEANS AND SWITCH ACTUATING MEANS FOR SEQUENTIALLY ACTUATING THE OPENING OF THE FIRST SWITCHING MEANS FIRST AND THEN ACTUATING THE OPENING OF THE SECOND SWITCHING MEANS IN A PREDETERMINED TIME RELATION AFTER THE OPENING OF THE FIRST SWITCHING MEANS.
Claim 2
Dependent Claim
92 words
A CIRCUIT INTERRUPTER COMPRISING, FIRST SWITCHING MEANS, THERMISTOR MEANS COMPRISING MATERIAL HAVING A POSITIVE TEMPERATURE COEFFICIENT WHOSE RESISTIVITY INCREASES RAPIDILY WITH TEMPERATURE CONNECTED ACROSS SAID FIRST SWITCH MEANS, VOLTAGE SENSITIVE MEANS HAVING A RESISTANCE WHICH DECREASES WITH VOLTAGE CONNECTED ACROSS SAID THERMISTOR MEANS, SECOND SWITCHING MEANS OPERATIVELY CONNECTED IN SERIES WITH SAID THERMISTOR MEANS AND SWITCH ACTUATING MEANS FOR SEQUENTIALLY ACTUATING THE OPENING OF THE FIRST SWITCHING MEANS FIRST AND THEN ACTUATING THE OPENING OF THE SECOND SWITCHING MEANS IN A PREDETERMINED TIME RELATION AFTER THE OPENING OF THE FIRST SWITCHING MEANS.
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) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |