Patent US2740879A successfully refreshed from Google Patents.
US2740879A
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Temperature-regulated electric hotplates
Assignee: Siemens Schuckertwerke AG
•
Filing: 1953-08-04
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Granted: 1956-04-03
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Expires: 1973-08-04
Abstract
No abstract record available.
Inventors
- 👤 Bieling Fritz
- 👤 Wiedemann Theo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:30
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/68; H05B3/72; F; F24; F24C; F24C15/00; F24C15/10; F24C15/102; F24C15/105; H01; H01H; H01H50/00; H01H50/16; H01H50/36; H01H2050/362; H01H37/00; H01H37/02; H01H37/64; H01H37/66
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2427945A
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US2410055A
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US2430194A
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US2644874A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |