US2676708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tilt safety valve for filters
Assignee: Individual
•
Filing: 1950-01-20
•
Granted: 1954-04-27
•
Expires: 1970-01-20
Abstract
No abstract record available.
Inventors
- 👤 Thomas H Risk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:04
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/23; B01D29/44; B01D29/46; B01D29/60; B01D29/606; B01D35/00; B01D35/14; B01D35/147; B01D35/157; Y; Y10; Y10T; Y10T137/00; Y10T137/0753; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86759; Y10T137/86791
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US988550A
Cited
US1076128A
Cited
GB188059A
Cited
US1683338A
Cited
US1781964A
Cited
US1859479A
Cited
US2079775A
Cited
US2342659A
Cited
US2342669A
Cited
US2488921A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |