Patent US2425640A successfully refreshed from Google Patents.
US2425640A
Expired / Lapsed
US
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Surface finishing
Assignee: STEEL PRODUCTS ENG CO
•
Filing: 1945-04-23
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Granted: 1947-08-12
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Expires: 1965-04-23
Abstract
No abstract record available.
Inventors
- 👤 Rodman C Pruitt
- 👤 Edward F Fowle
- 👤 Richard S Iglehart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:00
CPC Classifications
B; B24; B24B; B24B31/00; B24B31/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US226110A
Cited
US1963563A
Cited
US2268723A
Cited
US2276611A
Cited
US2218353A
Cited
US2318837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-11 | 1951-02-10 | 1951-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-11 | 1955-02-10 | 1955-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-11 | 1959-02-10 | 1959-08-12 | $7700.00 | Window Closed / Lapsed |