Patent US3058473A successfully refreshed from Google Patents.
US2866067A
Expired / Lapsed
US
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Electric heating circuit for electric heating devices
Assignee: Nortel Networks Ltd
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Filing: 1957-02-11
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Granted: 1958-12-23
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Expires: 1977-02-11
Abstract
No abstract record available.
Inventors
- 👤 Gordon R Dolan
- 👤 Carrel H Dykes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:21
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/2401
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB144669A
Cited
US2093745A
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US2510040A
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US2522753A
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US2588926A
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US2801317A
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US2779852A
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US2834862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |