Patent US3692027A successfully refreshed from Google Patents.
US2769892A
Expired / Lapsed
US
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Electrical heating device
Assignee: Individual
•
Filing: 1953-05-04
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Granted: 1956-11-06
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Expires: 1973-05-04
Abstract
No abstract record available.
Inventors
- 👤 Donald F Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:26
CPC Classifications
A; A43; A43B; A43B3/00; A43B3/34; A43B3/35; A43B3/355; H; H05; H05B; H05B3/00; H05B3/20; H05B3/34; H05B3/342; H05B2203/00; H05B2203/002; H05B2203/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US990206A
Cited
US1568757A
Cited
US1860420A
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US2298299A
Cited
US2339409A
Cited
US2494987A
Cited
US2617916A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |