Patent US4450545A successfully refreshed from Google Patents.
US2884091A
Expired / Lapsed
US
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Filters
Assignee: CAMBRIDGE FILTER Manufacturing CORP
•
Filing: 1957-05-06
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Granted: 1959-04-28
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Expires: 1977-05-06
Abstract
No abstract record available.
Inventors
- 👤 William W Baldwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:52
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/0002; B01D46/0084; B01D46/0097; B01D46/10; B01D2271/00; B01D2271/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1049789A
Cited
US2251964A
Cited
US2405293A
Cited
US2681155A
Cited
US2629459A
Cited
US2800195A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-27 | 1962-10-27 | 1963-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-27 | 1966-10-27 | 1967-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-27 | 1970-10-27 | 1971-04-28 | $7700.00 | Window Closed / Lapsed |