Patent US1389231A successfully refreshed from Google Patents.
US1389231A
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Mechanism for screening or sifting granulated substances
Assignee: DRAKES Ltd
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Filing: 1915-03-30
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Granted: 1921-08-30
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Expires: 1935-03-30
Abstract
No abstract record available.
Inventors
- 👤 Walker Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:24
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/18; B07B1/22; B07B1/24; B07B1/12
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) | 1924-08-29 | 1925-02-28 | 1925-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-08-29 | 1929-02-28 | 1929-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-08-29 | 1933-02-28 | 1933-08-30 | $7700.00 | Window Closed / Lapsed |