Patent US3523077A successfully refreshed from Google Patents.
US3523077A
Expired / Lapsed
US
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Uni-flow filter and method
Assignee: United States Department of Agriculture
•
Filing: 1968-10-11
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Granted: 1970-08-04
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Expires: 1988-10-11
Abstract
No abstract record available.
Inventors
- 👤 Wayne M Camirand
- 👤 Karel Popper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:07
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/62; B01D29/66; B01D29/11; B01D29/117; B01D29/118; Y; Y10; Y10S; Y10S210/00; Y10S210/918
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3389795A
Cited
US3423313A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-03 | 1974-02-02 | 1974-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-03 | 1978-02-02 | 1978-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-03 | 1982-02-02 | 1982-08-04 | $7700.00 | Window Closed / Lapsed |