Patent US2664492A successfully refreshed from Google Patents.
US2664492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating plate structure
Assignee: Individual
•
Filing: 1949-08-24
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Granted: 1953-12-29
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Expires: 1969-08-24
Abstract
No abstract record available.
Inventors
- 👤 Fischer Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:04
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/68; H05B3/70
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1257106A
Cited
US1715692A
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US1700543A
Cited
US1699737A
Cited
US2029573A
Cited
GB446410A
Cited
GB463007A
Cited
US2176382A
Cited
CH241189A
Cited
CH252708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |