Patent US2660840A successfully refreshed from Google Patents.
US2660840A
Expired / Lapsed
US
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Cone rib finishing machine
Assignee: Timken Co
•
Filing: 1950-03-16
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Granted: 1953-12-01
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Expires: 1970-03-16
Abstract
No abstract record available.
Inventors
- 👤 Albert L Bergstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:03
CPC Classifications
B; B24; B24B; B24B5/00; B24B5/02; B24B5/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US468535A
Cited
US551243A
Cited
US1675862A
Cited
US681440A
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US952866A
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US998508A
Cited
US1051646A
Cited
US1171174A
Cited
US1260022A
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US1261765A
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US1199836A
Cited
US1372553A
Cited
US1419140A
Cited
FR639894A
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US1878066A
Cited
GB463675A
Cited
US2435775A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |