Patent US2539844A successfully refreshed from Google Patents.
US2539844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilated buffing wheel
Assignee: AMERICAN BUFF Co
•
Filing: 1950-02-09
•
Granted: 1951-01-30
•
Expires: 1970-02-09
Abstract
No abstract record available.
Inventors
- 👤 Thomas H Kingsbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:19
CPC Classifications
B; B24; B24D; B24D13/00; B24D13/20; B24D13/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |