US2418282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasive manufacture
Assignee: Unifrax I LLC
•
Filing: 1942-10-07
•
Granted: 1947-04-01
•
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 15:16
CPC Classifications
B; B24; B24D; B24D11/00; B24D11/001; B24D11/005
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE30217C
Cited
US105320A
Cited
US305139A
Cited
US608877A
Cited
US711762A
Cited
US1009790A
Cited
US1566310A
Cited
US1621888A
Cited
US1847269A
Cited
US1945173A
Cited
US2286924A
Cited
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 |