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US3522679A
Expired / Lapsed
US
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Concrete abrading with free abrasive machine and method
Assignee: Tennant Co
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Filing: 1967-08-14
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Granted: 1970-08-04
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Expires: 1987-08-14
Abstract
No abstract record available.
Inventors
- 👤 Bertil J Sundberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:47
CPC Classifications
B; B24; B24B; B24B7/00; B24B7/10; B24B7/18; B24B7/186
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1618085A
Cited
US2200592A
Cited
US2950583A
Cited
DE1030219B
Cited
US3146559A
Cited
US3347596A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-03 | 1974-02-02 | 1974-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-03 | 1978-02-02 | 1978-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-03 | 1982-02-02 | 1982-08-04 | $7700.00 | Window Closed / Lapsed |