Patent US2715668A successfully refreshed from Google Patents.
US2715668A
Expired / Lapsed
US
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Electrically conductive film panel heaters
Assignee: ELECTROFILM Inc
•
Filing: 1952-10-23
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Granted: 1955-08-16
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Expires: 1972-10-23
Abstract
No abstract record available.
Inventors
- 👤 Aylwin R Booker
- 👤 Ralph E Crump
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:07
CPC Classifications
F; F24; F24C; F24C7/00; F24C7/04; F24C7/043
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2084468A
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US2205543A
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US2504146A
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US2230095A
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US2525850A
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US2545805A
Cited
US2615115A
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US2613308A
Cited
US2634361A
Cited
US2623150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-08-15 | 1959-02-14 | 1959-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-08-15 | 1963-02-14 | 1963-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-08-15 | 1967-02-14 | 1967-08-16 | $7700.00 | Window Closed / Lapsed |