US2659587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calcining apparatus
Assignee: Individual
•
Filing: 1951-01-11
•
Granted: 1953-11-17
•
Expires: 1971-01-11
Abstract
No abstract record available.
Inventors
- 👤 Bowen William Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:54
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/02; C22B1/10; B; B01; B01J; B01J6/00; B01J6/001; B01J6/004; C04; C04B; C04B7/00; C04B7/36; C04B7/38; C04B7/40; F; F26; F26B; F26B17/00; F26B17/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US729009A
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US729008A
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US1722175A
Cited
US1831625A
Cited
US2054441A
Cited
US2409707A
Cited
US2575119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-16 | 1957-05-18 | 1957-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-16 | 1961-05-18 | 1961-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-16 | 1965-05-18 | 1965-11-17 | $7700.00 | Window Closed / Lapsed |