US2820281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasive article
Assignee: RED DEVIL TOOLS
•
Filing: 1956-11-30
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Granted: 1958-01-21
•
Expires: 1976-11-30
Abstract
No abstract record available.
Inventors
- 👤 Alfred W Amsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:18
CPC Classifications
B; B24; B24D; B24D15/00; B24D15/02; Y; Y10; Y10T; Y10T225/00; Y10T225/20; Y10T225/298; Y10T407/00; Y10T407/18; Y10T407/1805
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |