Patent US1247427A successfully refreshed from Google Patents.
US1247427A
Expired / Lapsed
US
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Screening mechanism.
Assignee: Jeffrey Manufacturing Co
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Filing: 1914-04-07
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Granted: 1917-11-20
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Expires: 1934-04-07
Abstract
No abstract record available.
Inventors
- 👤 William K Liggett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:10
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/28; B07B1/34; B07B1/343
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) | 1920-11-19 | 1921-05-21 | 1921-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-11-19 | 1925-05-21 | 1925-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-11-19 | 1929-05-21 | 1929-11-20 | $7700.00 | Window Closed / Lapsed |