Patent US2394792A successfully refreshed from Google Patents.
US1851421A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wrench for valve-seats and the like
Assignee: Individual
•
Filing: 1931-03-20
•
Granted: 1932-03-29
•
Expires: 1951-03-20
Abstract
No abstract record available.
Inventors
- 👤 Alfred A Conklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:10
CPC Classifications
B; B25; B25B; B25B13/00; B25B13/48; B25B13/481; B25B27/00; B25B27/14; B25B27/143; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53552
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1935-03-29 | 1935-09-28 | 1936-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-03-29 | 1939-09-28 | 1940-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-03-29 | 1943-09-28 | 1944-03-29 | $7700.00 | Window Closed / Lapsed |