Patent US2512422A successfully refreshed from Google Patents.
US2512422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic coal cleaner
Assignee: Individual
•
Filing: 1946-11-21
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Granted: 1950-06-20
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Expires: 1966-11-21
Abstract
No abstract record available.
Inventors
- 👤 James H Fletcher
- 👤 Harry A Treadwell
- 👤 George W Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:06
CPC Classifications
B; B03; B03B; B03B4/00; B03B4/005; F; F16; F16F; F16F15/00; F16F15/02; F16F15/04; F16F15/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US775945A
Cited
US711016A
Cited
US1843405A
Cited
US2028904A
Cited
US2279590A
Cited
US2291661A
Cited
US2374865A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-19 | 1953-12-19 | 1954-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-19 | 1957-12-19 | 1958-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-19 | 1961-12-19 | 1962-06-20 | $7700.00 | Window Closed / Lapsed |