US2937752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter system
Assignee: Individual
•
Filing: 1955-08-23
•
Granted: 1960-05-24
•
Expires: 1975-08-23
Abstract
No abstract record available.
Inventors
- 👤 Paul R Deschere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:57
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/46; B01D24/4631; B01D24/02; B01D24/10; B01D24/105
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US847537A
Cited
US2174769A
Cited
US2200795A
Cited
US2347927A
Cited
US2468188A
Cited
US2711994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-24 | 1963-11-23 | 1964-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-24 | 1967-11-23 | 1968-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-24 | 1971-11-23 | 1972-05-24 | $7700.00 | Window Closed / Lapsed |