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
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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 00:20
CPC Classifications
B; B23; B23H; B23H9/00; B23H9/008; B26; B26F; B26F1/00; B26F1/26; B26F1/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2163294A
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US3369152A
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US3385951A
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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 |