US2900290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing electric sheet-type heater
Assignee: Individual
•
Filing: 1957-07-29
•
Granted: 1959-08-18
•
Expires: 1977-07-29
Abstract
No abstract record available.
Inventors
- 👤 Bethge Walther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:22
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/16; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1089; Y10T156/109
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2022827A
Cited
US1376987A
Cited
US1943062A
Cited
US2528360A
Cited
US2566921A
Cited
US2741692A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |