Patent US2372974A successfully refreshed from Google Patents.
Patent US2985307A successfully refreshed from Google Patents.
US2985307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water filters
Assignee: Individual
•
Filing: 1956-08-29
•
Granted: 1961-05-23
•
Expires: 1976-08-29
Abstract
No abstract record available.
Inventors
- 👤 Robert H Grasmere
- 👤 Bruce J Oliver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:20
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21; B01D37/00; B01D37/02
Claims Analysis
Total Claims: 0
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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) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |