Patent US3213177A successfully refreshed from Google Patents.
US3213177A
Expired / Lapsed
US
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Resistance furnace
Assignee: General Electric Co
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Filing: 1963-06-04
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Granted: 1965-10-19
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Expires: 1983-06-04
Abstract
No abstract record available.
Inventors
- 👤 Russell J Diefendorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:31
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/62; H05B3/64
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
100 words
A RESISTANCE FURNACE COMPRISING A HIGH TEMPERATURE HEATING ELEMENT, A PAIR OF PYROLYTIC GRAPHITE ELECTRODES IN ELECTRICAL CONTACT WITH OPPOSITE ENDS OF SAID ELEMENT, SAID HEATING ELEMENT BEING LONGER THAN THE COMBINED THICKNESSES OF SAID PAIR O PYROLYTIC GRAPHITE ELECTRODES,THERMAL INSULATION SURROUNDING SAID ELEMENT, A CASING SURROUNDING SAID THERMAL INSULATION, A METAL ELECTRODE IN CONTACT WITH EACH END OF SAID CASING AND ELECTRICALLY INSULATED THEREFROM, AN ELECTRICAL LEAD CONNECTED TO EACH OF SAID METAL ELECTRODES, EACH OF SAID PYROLYTIC GRAPHITE ELECTRODES IN ELECTRICAL CONTACT WITH ONE OF SAID METAL ELECTRODES, AND AN APERTURED COVER AT EACH END OF SAID CASING.
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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) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |