Patent US4110190A successfully refreshed from Google Patents.
US4110190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for machining electrically conducting substances by electrochemical attack
Assignee: Ultra Centrifuge Nederland NV
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Filing: 1977-12-07
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Granted: 1978-08-29
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Expires: 1997-12-07
Abstract
Abstract Apparatus for etching fine grooves in surfaces by the combination of pulsed currents in a modified Electro-Chemical Machining method in combination with a flow guiding template. The apparatus is very suitable for the etching of grooves in a surface used in a bearing.
Inventors
- 👤 Kommer Visser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:40
CPC Classifications
B; B23; B23H; B23H3/00; B23H3/02; B23H9/00; B23H9/06; B23H2200/00; B23H2200/10; Y; Y10; Y10S; Y10S204/00; Y10S204/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
121 words
In an apparatus for removing material from an electrically conducting workpiece by electrochemical attack of the kind including an electrically insulating flow-guiding template having afflux channels in a surface of the template, said channels being in communication with at least one liquid inlet and at least one liquid outlet and said template surface being adapted to engage the surface of the workpiece, the improvement which comprises electrodes disposed in said channels and embedded in the template, means for connecting the electrodes to the negative pole of a direct current source via a series-connected pulse generator and resistor, a current integrator connected in parallel to the resistor, and means for connecting the positive pole of the direct current source to the workpiece.
Claim 2
Dependent Claim
121 words
In an apparatus for removing material from an electrically conducting workpiece by electrochemical attack of the kind including an electrically insulating flow-guiding template having afflux channels in a surface of the template, said channels being in communication with at least one liquid inlet and at least one liquid outlet and said template surface being adapted to engage the surface of the workpiece, the improvement which comprises electrodes disposed in said channels and embedded in the template, means for connecting the electrodes to the negative pole of a direct current source via a series-connected pulse generator and resistor, a current integrator connected in parallel to the resistor, and means for connecting the positive pole of the direct current source to the workpiece.
Claim 3
Dependent Claim
17 words
An apparatus according to claim 1 wherein the pulse generator supplies pulses between 5 and 20 milliseconds.
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) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |