US3483374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the surface treatment of workpieces by electrical discharges
Assignee: Rio Tinto Switzerland AG
•
Filing: 1967-01-23
•
Granted: 1969-12-09
•
Expires: 1987-01-23
Abstract
No abstract record available.
Inventors
- 👤 Dietrich Erben
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:05
CPC Classifications
B; B23; B23H; B23H9/00; B23H9/008; B26; B26F; B26F1/00; B26F1/26; B26F1/28
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2087915A
Cited
US2163294A
Cited
GB637793A
Cited
US2910723A
Cited
US2763759A
Cited
US2935418A
Cited
US2864756A
Cited
BE570440A
Cited
US3370200A
Cited
US3203809A
Cited
US3369152A
Cited
US3385951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-08 | 1973-06-09 | 1973-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-08 | 1977-06-09 | 1977-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-08 | 1981-06-09 | 1981-12-09 | $7700.00 | Window Closed / Lapsed |