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US2678169A
Expired / Lapsed
US
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Impact hammer mill
Assignee: Individual
•
Filing: 1951-04-17
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Granted: 1954-05-11
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Expires: 1971-04-17
Abstract
No abstract record available.
Inventors
- 👤 David R Tullis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:24
CPC Classifications
B; B02; B02C; B02C13/00; B02C13/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB235955A
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US1698758A
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US1755573A
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US1915920A
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US2105759A
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US2233728A
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US2309326A
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US2588865A
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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) | 1957-05-10 | 1957-11-09 | 1958-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-10 | 1961-11-09 | 1962-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-10 | 1965-11-09 | 1966-05-11 | $7700.00 | Window Closed / Lapsed |