US2640861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistance furnace
Assignee: Harshaw Chemical Co
•
Filing: 1950-11-27
•
Granted: 1953-06-02
•
Expires: 1970-11-27
Abstract
No abstract record available.
Inventors
- 👤 Harry C Kremers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:37
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/62; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1092
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1318028A
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US761201A
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US1418496A
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US1581829A
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US2009732A
Cited
US2161916A
Cited
US2404060A
Cited
US2476916A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |