US2874845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtration system
Assignee: Tower Iron Works Inc
•
Filing: 1956-06-04
•
Granted: 1959-02-24
•
Expires: 1976-06-04
Abstract
No abstract record available.
Inventors
- 👤 Fain Morton Edgar
- 👤 Jr Harry Copley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:37
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/68; C02F1/685; C02F1/688; B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/23; B01D29/50; B01D29/52; B01D29/54; B01D36/00; B01D36/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US355005A
Cited
US653684A
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US691706A
Cited
FR323562A
Cited
US855328A
Cited
US1081515A
Cited
US1696735A
Cited
US2000137A
Cited
US2435201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |