US3753890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple tool for electrochemical machining or forming
Assignee: Koppern and Co KG
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Filing: 1969-08-15
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Granted: 1973-08-21
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Expires: 1989-08-15
Abstract
Abstract An improved multiple tool for electrochemical machining or forming, with a plurality of simultaneously operating individual tools for processing large workpiece, wherein the number of countersinking operations is a multiple of the number of individual tools, wherein the improvement comprises a reliable safety arrangement against leakage of the electrolyte so as to prevent the whole surface of the workpiece from being exposed to the action of the electrolyte.
Inventors
- 👤 H Koeppern
- 👤 H Kubeth
- 👤 L Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:03
CPC Classifications
B; B23; B23H; B23H3/00; B23H3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |