Patent US4396983A successfully refreshed from Google Patents.
US2808044A
Expired / Lapsed
US
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Diamond abrasive blades
Assignee: Unifrax I LLC
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Filing: 1955-12-21
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Granted: 1957-10-01
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Expires: 1975-12-21
Abstract
No abstract record available.
Inventors
- 👤 Frederick A Upper
- 👤 James H Denton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:18
CPC Classifications
B; B28; B28D; B28D1/00; B28D1/02; B28D1/12; B28D1/121; B24; B24D; B24D5/00; B24D5/12; B24D5/123
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1699746A
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US2064407A
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US2065041A
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US2088998A
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GB523879A
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GB542054A
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US2442153A
Cited
US2589357A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |