US2637952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Back-stand grinder
Assignee: 3M Co
•
Filing: 1949-11-14
•
Granted: 1953-05-12
•
Expires: 1969-11-14
Abstract
No abstract record available.
Inventors
- 👤 Ralph W Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:20
CPC Classifications
B; B24; B24B; B24B21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1160099A
Cited
US1108176A
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US1228856A
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US1821624A
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US1853516A
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US1825883A
Cited
US2300643A
Cited
US2332329A
Cited
US2402131A
Cited
US2452205A
Cited
US2479536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |