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Patent US3478879A successfully refreshed from Google Patents.
US3478879A
Expired / Lapsed
US
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Method and apparatus for filtering with overlapped filter medium
Assignee: Individual
•
Filing: 1967-08-24
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Granted: 1969-11-18
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Expires: 1987-08-24
Abstract
No abstract record available.
Inventors
- 👤 Gene Hirs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:11
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/09; B01D29/096; B01D29/50; B01D29/52; B01D2201/00; B01D2201/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |