US3471025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter comprising a bed of buoyant and a bed of non-bouyant sand
Assignee: Procter and Gamble Co
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Filing: 1968-12-13
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Granted: 1969-10-07
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Expires: 1988-12-13
Abstract
No abstract record available.
Inventors
- 👤 Robert D Dobson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:03
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/02; B01D39/06; B01D24/00; B01D24/007; B01D24/008; B01D24/02; B01D24/10; B01D24/12; B01D24/46; B01D24/4631; B01D2201/00; B01D2201/14; B01D2201/18; B01D2201/188; C; C02; C02F; C02F1/00; C02F1/28; C02F1/285
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) | 1972-10-06 | 1973-04-07 | 1973-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-06 | 1977-04-07 | 1977-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-06 | 1981-04-07 | 1981-10-07 | $7700.00 | Window Closed / Lapsed |