Patent US3234316A successfully refreshed from Google Patents.
US3234316A
Expired / Lapsed
US
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Device for detecting grounds in electric furnaces
Assignee: Electric Furnace Co
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Filing: 1963-03-20
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Granted: 1966-02-08
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Expires: 1983-03-20
Abstract
No abstract record available.
Inventors
- 👤 Mathews Frank Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:14
CPC Classifications
F; F27; F27D; F27D11/00; H; H05; H05B; H05B6/00; H05B6/02; H05B6/22; H05B6/24; H05B6/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
IN THE COMBINATION OF A FURNACE HAVING A METAL FRAME, AN ELECTRICAL POWERED HEATING ELEMENT ADJACENT SAID FRAME, AND SWITCH MEANS FOR DE-ERNERGIZING SAID HEATING ELEMENT, THE IMPROVEMENT COMPRISING: MEANS FOR DETECTING WHETHER SAID ELEMENT IS GROUNDED TO SAID FRAME AND INCLUDING A POWER SUPPLY CONNECTED IN SERIES CIRCUIT EXTENDING FROM SAID FRAME TO SAID ELEMENT, SIGNAL MEANS, AND ACTUATOR MEANS IN SAID SERIES CIRCUIT RESPONSIVE TO CURRENT FLOW THROUGH THE CIRCUIT FOR ENERGIZING SAID SIGNAL MEANS.
Claim 2
Dependent Claim
77 words
IN THE COMBINATION OF A FURNACE HAVING A METAL FRAME, AN ELECTRICAL POWERED HEATING ELEMENT ADJACENT SAID FRAME, AND SWITCH MEANS FOR DE-ERNERGIZING SAID HEATING ELEMENT, THE IMPROVEMENT COMPRISING: MEANS FOR DETECTING WHETHER SAID ELEMENT IS GROUNDED TO SAID FRAME AND INCLUDING A POWER SUPPLY CONNECTED IN SERIES CIRCUIT EXTENDING FROM SAID FRAME TO SAID ELEMENT, SIGNAL MEANS, AND ACTUATOR MEANS IN SAID SERIES CIRCUIT RESPONSIVE TO CURRENT FLOW THROUGH THE CIRCUIT FOR ENERGIZING SAID SIGNAL MEANS.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
US2542838A
Cited
US2637843A
Cited
US3086999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |