US2802929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and apparatus for surface grinding materials
Assignee: SPAREATRON Ltd
•
Filing: 1953-10-20
•
Granted: 1957-08-13
•
Expires: 1973-10-20
Abstract
No abstract record available.
Inventors
- 👤 Fefer Gregory
- 👤 Rudorff Dagobert William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:14
CPC Classifications
B; B24; B24B; B24B21/00; B24B21/16
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US416873A
Cited
US2355838A
Cited
US2319401A
Cited
US2431822A
Cited
US2385665A
Cited
US2526423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-12 | 1961-02-11 | 1961-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-12 | 1965-02-11 | 1965-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-12 | 1969-02-11 | 1969-08-13 | $7700.00 | Window Closed / Lapsed |