US2988860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasive structures and reinforcing therefor
Assignee: 3M Co
•
Filing: 1954-09-10
•
Granted: 1961-06-20
•
Expires: 1974-09-10
Abstract
No abstract record available.
Inventors
- 👤 William E Sohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:35
CPC Classifications
B; B24; B24D; B24D5/00; B24D5/02; B24D5/04; F; F01; F01N; F01N2490/00; F01N2490/15; F01N2490/155
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US228257A
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US699302A
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US1860724A
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US1970772A
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US2134738A
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US2147438A
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US2178855A
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FR950453A
Cited
US2643494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |