US2648805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controllable electric resistance device
Assignee: Siemens Schuckertwerke AG
•
Filing: 1950-10-21
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Granted: 1953-08-11
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Expires: 1970-10-21
Abstract
No abstract record available.
Inventors
- 👤 Spenke Eberhard Hermann Georg
- 👤 Rose Frank Wenzel Georg
- 👤 Waldkotter Erich Gerhar Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:21
CPC Classifications
H; H10; H10D; H10D30/00; H10D30/80; H10D30/83; H10D99/00; H10P; H10P95/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1900018A
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US1949383A
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US2173904A
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US2208455A
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US2438893A
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US2524033A
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US2524034A
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US2524035A
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US2560594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |