US3440156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical machining including controlling the gap voltage using a constant electrode advance
Assignee: Associated Engineering Ltd
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Filing: 1966-05-02
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Granted: 1969-04-22
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Expires: 1986-05-02
Abstract
No abstract record available.
Inventors
- 👤 Eric Winston Dickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:18
CPC Classifications
B; B23; B23H; B23H3/00; B23H3/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
APPARATUS FOR CARRYING OUT ELECTROCHEMICAL MACHINING COMPRISING A WORKPIECE AND A TOOL CONNECTED IN AN ELECTRIC CIRCUIT WITH A VOLTAGE STABILIZED POWER SUPPLY SO THAT THE WORKPIECE FORMS AN ANODE AND THE TOOL A CATHODE, MEANS FOR FLOWING AN ELECTROLYTE THROUGH A GAP BETWEEN THE TOOL AND THE WORKPIECE AT A SUBSTANTIALLY CONSTANT RATE, MEANS FOR RELATIVELY MOVING THE TOOL TOWARDS THE WORKPIECE AT A CONSTANT ADVANCE RATE AS THE MATERIAL OF THE WORKPIECE IS REMOVED, MEANS FOR PRODUCING A SIGNAL DEPENDENT ON THE ELECTROLYTE CONDUCTIVITY AND MEANS FOR CONTROLLING THE VOLTAGE APPLIED BETWEEN THE TOOL AND THE WORKPIECE ACROSS THE WORKING GAP BY MEANS OF THE SIGNAL
Claim 2
Dependent Claim
108 words
APPARATUS FOR CARRYING OUT ELECTROCHEMICAL MACHINING COMPRISING A WORKPIECE AND A TOOL CONNECTED IN AN ELECTRIC CIRCUIT WITH A VOLTAGE STABILIZED POWER SUPPLY SO THAT THE WORKPIECE FORMS AN ANODE AND THE TOOL A CATHODE, MEANS FOR FLOWING AN ELECTROLYTE THROUGH A GAP BETWEEN THE TOOL AND THE WORKPIECE AT A SUBSTANTIALLY CONSTANT RATE, MEANS FOR RELATIVELY MOVING THE TOOL TOWARDS THE WORKPIECE AT A CONSTANT ADVANCE RATE AS THE MATERIAL OF THE WORKPIECE IS REMOVED, MEANS FOR PRODUCING A SIGNAL DEPENDENT ON THE ELECTROLYTE CONDUCTIVITY AND MEANS FOR CONTROLLING THE VOLTAGE APPLIED BETWEEN THE TOOL AND THE WORKPIECE ACROSS THE WORKING GAP BY MEANS OF THE SIGNAL
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |