Patent US2938992A successfully refreshed from Google Patents.
US2938992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heaters using conductive woven tapes
Assignee: ELECTROFILM Inc
•
Filing: 1958-04-18
•
Granted: 1960-05-31
•
Expires: 1978-04-18
Abstract
No abstract record available.
Inventors
- 👤 Ralph E Crump
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:01
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/34; H05B3/342; H05B3/347; H05B2203/00; H05B2203/002; H05B2203/005; H05B2203/011; H05B2203/014; H05B2203/015; H05B2203/017; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49083
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1615294A
Cited
US2345300A
Cited
US2496279A
Cited
US2511540A
Cited
US2533409A
Cited
US2503457A
Cited
US2522542A
Cited
US2643320A
Cited
US2719907A
Cited
US2759092A
Cited
US2817737A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |