US2501000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve grinding tool
Assignee: LEONARD A PARKS
•
Filing: 1948-07-26
•
Granted: 1950-03-21
•
Expires: 1968-07-26
Abstract
No abstract record available.
Inventors
- 👤 Conrad E Murphey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:11
CPC Classifications
B; B24; B24B; B24B15/00; Y; Y10; Y10T; Y10T408/00; Y10T408/55; Y10T408/89; Y10T408/907
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US692459A
Cited
US884942A
Cited
US1183855A
Cited
US1604966A
Cited
US1663420A
Cited
US1824327A
Cited
US2130506A
Cited
US2106201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |