Patent US4520041A successfully refreshed from Google Patents.
US2451024A
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US
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Method of calcining and calcining apparatus
Assignee: Individual
•
Filing: 1942-04-07
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Granted: 1948-10-12
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Expires: 1962-04-07
Abstract
No abstract record available.
Inventors
- 👤 Thomas R Ellerbeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:22
CPC Classifications
F; F27; F27B; F27B1/00; F27B1/08; C; C04; C04B; C04B2/00; C04B2/10; C04B2/12; F27B1/005
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-12 | 1952-04-12 | 1952-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-12 | 1956-04-12 | 1956-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-12 | 1960-04-12 | 1960-10-12 | $7700.00 | Window Closed / Lapsed |