Patent US2418282A successfully refreshed from Google Patents.
US2418282A
Expired / Lapsed
US
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Abrasive manufacture
Assignee: Unifrax I LLC
•
Filing: 1942-10-07
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Granted: 1947-04-01
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Expires: 1962-10-07
Abstract
No abstract record available.
Inventors
- 👤 John A Williamson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:26
CPC Classifications
B; B24; B24D; B24D11/00; B24D11/001; B24D11/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US105320A
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US305139A
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US608877A
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US1009790A
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US1566310A
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US1621888A
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US1945173A
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US2286924A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-03-31 | 1950-09-30 | 1951-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-03-31 | 1954-09-30 | 1955-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-03-31 | 1958-09-30 | 1959-04-01 | $7700.00 | Window Closed / Lapsed |