Patent US4763022A successfully refreshed from Google Patents.
US2457012A
Expired / Lapsed
US
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Abrasive article and method of making
Assignee: Unifrax I LLC
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Filing: 1944-06-27
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Granted: 1948-12-21
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Expires: 1964-06-27
Abstract
No abstract record available.
Inventors
- 👤 Frederick A Upper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:09
CPC Classifications
B; B24; B24D; B24D18/00; B24D18/0045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US105320A
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US305210A
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US305139A
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US1303541A
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US732949A
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US1435721A
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US2092978A
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US2241433A
Cited
US2284716A
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US2355667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-21 | 1952-06-21 | 1952-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-21 | 1956-06-21 | 1956-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-21 | 1960-06-21 | 1960-12-21 | $7700.00 | Window Closed / Lapsed |