Patent US3489541A successfully refreshed from Google Patents.
US3489541A
Expired / Lapsed
US
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Method of treating abrasive grains and products made thereby
Assignee: American Abrasive Corp
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Filing: 1966-05-16
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Granted: 1970-01-13
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Expires: 1986-05-16
Abstract
No abstract record available.
Inventors
- 👤 Israel V Steinberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:24
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1436; B; B24; B24D; B24D18/00; C09K3/1409
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1037999A
Cited
US2213332A
Cited
US2216135A
Cited
US2294239A
Cited
US2541658A
Cited
US2878111A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |