US2522639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for thermal treatment of solids
Assignee: Pickands Mather and Co
•
Filing: 1946-10-01
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Granted: 1950-09-19
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Expires: 1966-10-01
Abstract
No abstract record available.
Inventors
- 👤 Percy H Royster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:26
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/20; F27B7/38; F27B7/383; C; C04; C04B; C04B11/00; C04B11/02; C04B11/028; C04B2/00; C04B2/10; C04B7/00; C04B7/36; C04B7/43
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-18 | 1954-03-20 | 1954-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-18 | 1958-03-20 | 1958-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-18 | 1962-03-20 | 1962-09-19 | $7700.00 | Window Closed / Lapsed |