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US1429477A
Expired / Lapsed
US
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Filter-bottom construction
Assignee: Individual
•
Filing: 1921-08-17
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Granted: 1922-09-19
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Expires: 1941-08-17
Abstract
No abstract record available.
Inventors
- 👤 James E Williamson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:55
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/001; B01D24/007; B01D24/02; B01D24/20; B01D24/24; B01D24/46; B01D24/4626; B01D24/4631
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) | 1925-09-18 | 1926-03-20 | 1926-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-09-18 | 1930-03-20 | 1930-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-09-18 | 1934-03-20 | 1934-09-19 | $7700.00 | Window Closed / Lapsed |