Patent US2156664A successfully refreshed from Google Patents.
Patent US2252814A successfully refreshed from Google Patents.
US2252814A
Expired / Lapsed
US
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Coal drying apparatus
Assignee: Individual
•
Filing: 1939-10-25
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Granted: 1941-08-19
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Expires: 1959-10-25
Abstract
No abstract record available.
Inventors
- 👤 George N Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:04
CPC Classifications
F; F26; F26B; F26B17/00; F26B17/02; F26B17/04; F26B17/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-08-18 | 1945-02-17 | 1945-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-08-18 | 1949-02-17 | 1949-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-08-18 | 1953-02-17 | 1953-08-19 | $7700.00 | Window Closed / Lapsed |