Patent US1643299A successfully refreshed from Google Patents.
US1643299A
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US
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Apparatus for filtering
Assignee: CELLOCILK Co
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Filing: 1924-12-06
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Granted: 1927-09-27
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Expires: 1944-12-06
Abstract
No abstract record available.
Inventors
- 👤 William H Furness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:58
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/44; B01D29/46
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) | 1930-09-26 | 1931-03-28 | 1931-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-09-26 | 1935-03-28 | 1935-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-09-26 | 1939-03-28 | 1939-09-27 | $7700.00 | Window Closed / Lapsed |