Patent US2713759A successfully refreshed from Google Patents.
US2713759A
Expired / Lapsed
US
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Rotary abrasive heads
Assignee: Engis Equipment Co
•
Filing: 1953-03-23
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Granted: 1955-07-26
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Expires: 1973-03-23
Abstract
No abstract record available.
Inventors
- 👤 Swan Richard James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:39
CPC Classifications
B; B24; B24D; B24D9/00; B24D9/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2125460A
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US2194577A
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US2430099A
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US2522920A
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US2474063A
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US2533619A
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US2600613A
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US2601499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-07-25 | 1959-01-24 | 1959-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-07-25 | 1963-01-24 | 1963-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-07-25 | 1967-01-24 | 1967-07-26 | $7700.00 | Window Closed / Lapsed |