Patent US1880273A successfully refreshed from Google Patents.
US1880273A
Expired / Lapsed
US
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Coal drier
Assignee: ANTHRACITE SEPARATOR CO
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Filing: 1929-05-06
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Granted: 1932-10-04
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Expires: 1949-05-06
Abstract
No abstract record available.
Inventors
- 👤 Pardee Frank
- 👤 Jr Frank Pardee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:18
CPC Classifications
F; F26; F26B; F26B17/00; F26B17/10; F26B17/101; F26B17/104; F26B17/105; F26B17/24
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) | 1935-10-04 | 1936-04-04 | 1936-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-10-04 | 1940-04-04 | 1940-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-10-04 | 1944-04-04 | 1944-10-04 | $7700.00 | Window Closed / Lapsed |