Patent US2840957A successfully refreshed from Google Patents.
US2840957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lapping device
Assignee: Individual
•
Filing: 1957-06-07
•
Granted: 1958-07-01
•
Expires: 1977-06-07
Abstract
No abstract record available.
Inventors
- 👤 Walter J Warden
- 👤 Heinz P Wasshausen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:23
CPC Classifications
B; B24; B24B; B24B37/00; B24B37/005; B24B37/013; B24D; B24D7/00; B24D7/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2722089A
Cited
US2779139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |