Patent US2865510A successfully refreshed from Google Patents.
US2865510A
Expired / Lapsed
US
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Multiple stage gravity filters
Assignee: Individual
•
Filing: 1956-10-22
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Granted: 1958-12-23
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Expires: 1976-10-22
Abstract
No abstract record available.
Inventors
- 👤 Raymond W Greene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:04
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/50; B01D29/56; B01D29/58; B01D29/11; B01D29/13; B01D29/23; B01D2201/00; B01D2201/04; B01D2201/043; B01D2201/0446; B01D37/00; B01D37/04; Y; Y10; Y10S; Y10S210/00; Y10S210/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1140726A
Cited
US2685347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |