Patent US2685969A successfully refreshed from Google Patents.
US2685969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stmjes ratent office
Assignee: —
•
Filing: —
•
Granted: 1954-08-10
•
Expires: 1971-08-10
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:01
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US669129A
Cited
US1122393A
Cited
US1682897A
Cited
US1941982A
Cited
US2093167A
Cited
US2147792A
Cited
US2337575A
Cited
US2298674A
Cited
US2298980A
Cited
US2348725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-09 | 1958-02-08 | 1958-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-09 | 1962-02-08 | 1962-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-09 | 1966-02-08 | 1966-08-10 | $7700.00 | Window Closed / Lapsed |