US3421630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter element and filter system
Assignee: Individual
•
Filing: 1966-04-15
•
Granted: 1969-01-14
•
Expires: 1986-04-15
Abstract
No abstract record available.
Inventors
- 👤 William A Acosta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:24
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; F16K3/04; B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/23; B01D29/50; B01D29/52; B01D29/54; B01D29/62; B01D29/66; B01D29/668; B01D29/70; B01D2201/00; B01D2201/16; B01D2201/28; B01D2201/287; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86348; Y10T137/86493; Y10T137/86863; Y10T137/86871
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US261119A
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US1633818A
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US2586513A
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US3154485A
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US3305098A
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US3283904A
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US3211292A
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US3280980A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |