US2601749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring tension grinding machine
Assignee: Individual
•
Filing: 1949-08-15
•
Granted: 1952-07-01
•
Expires: 1969-08-15
Abstract
No abstract record available.
Inventors
- 👤 Arnold R Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:33
CPC Classifications
B; B24; B24B; B24B3/00; B24B3/36; B24B3/54; B24B21/00; B24B21/002
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US339095A
Cited
US572812A
Cited
US799442A
Cited
GB190423453A
Cited
US908977A
Cited
US916328A
Cited
US1005734A
Cited
US1356338A
Cited
US2124592A
Cited
US2341068A
Cited
US2391322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-01 | 1955-12-31 | 1956-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-01 | 1959-12-31 | 1960-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-01 | 1963-12-31 | 1964-07-01 | $7700.00 | Window Closed / Lapsed |