Patent US3580834A successfully refreshed from Google Patents.
US3580834A
Expired / Lapsed
US
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Apparatus for machining metals electrochemically
Assignee: Kearney and Trecker Corp
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Filing: 1967-12-04
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Granted: 1971-05-25
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Expires: 1987-12-04
Abstract
Abstract AN APPARATUS FOR THE ELECTROCHEMICAL MACHINING OF FLAT METAL SURFACES WHICH UTILIZES A POOL OF VISCOUS ELECTROLYTE OF SUFFICIENT VISCOSITY TO SUPPORT A WORKPIECE AND SPACE THE WORKPIECE VERY SLIGHTLY FROM THE SURFACE PLATE, AS WELL AS TO FACILITATE MOVEMENT OF THE WORKPIECE OVER THE SURFACE PLATE. MOVEMENT OF THE WORKPIECE IN COMBINATION WITH VARIOUS VISCOSITES OF THE VISCOUS ELECTROLYTE ARE UTILIIZED TO OBTAIN THE DEGREE OF FLATNESS DESIRED.
Inventors
- 👤 Robert K Sedgwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:45
CPC Classifications
B; B23; B23H; B23H3/00
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |