US2674445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace for exfoliating perlite or the like
Assignee: JOHN DECA MINES FURNACE Inc
•
Filing: 1951-02-13
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Granted: 1954-04-06
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Expires: 1971-02-13
Abstract
No abstract record available.
Inventors
- 👤 Charles P Diehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:17
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/02; C04B20/04; C04B20/06; C04B20/061
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1459923A
Cited
US672065A
Cited
US1640528A
Cited
US2424330A
Cited
US2501962A
Cited
US2518636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-05 | 1957-10-05 | 1958-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-05 | 1961-10-05 | 1962-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-05 | 1965-10-05 | 1966-04-06 | $7700.00 | Window Closed / Lapsed |