Patent US2028183A successfully refreshed from Google Patents.
US2028183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasive wheel and method of making the same
Assignee: Unifrax I LLC
•
Filing: 1930-04-18
•
Granted: 1936-01-21
•
Expires: 1950-04-18
Abstract
No abstract record available.
Inventors
- 👤 Benner Raymond Calvin
- 👤 Soley William George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:04
CPC Classifications
B; B24; B24D; B24D5/00; B24D5/02; B24D5/04
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) | 1939-01-20 | 1939-07-22 | 1940-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-01-20 | 1943-07-22 | 1944-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-01-20 | 1947-07-22 | 1948-01-21 | $7700.00 | Window Closed / Lapsed |