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US2661385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Muffle type furnace
Assignee: —
•
Filing: —
•
Granted: 1953-12-01
•
Expires: 1970-12-01
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:43
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/62; H05B3/64; F; F27; F27D; F27D11/00; F27D11/02; F27D99/00; F27D99/0001; F27D99/0006; F27D2099/0008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2024714A
Cited
US1158972A
Cited
US1837178A
Cited
US2073501A
Cited
US2192191A
Cited
US2145324A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |