Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1983-03-28
1985-02-05
Douglas, Winston A.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
2041294, C25F 302, H01L 21306, B44C 122
Patent
active
044976992
ABSTRACT:
A method of treating foil for use in electrolytic capacitors in which the foil moves in one direction through a treatment liquid and in which the capacitance is measured continuously by means of at least one current-carrying electrode from which alternating current is conveyed and at least one voltage electrode at a small distance from the foil. The foil capacitance is measured by means of a phase-sensitive voltmeter. The measured capacitance is used to control the treatment method, etching or forming. In a preferred embodiment two current-carrying electrodes are present on either side of the foil and two voltage electrodes are present between the current-carrying electrodes and the foil on either side thereof. This avoids contacting of the foil.
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patent: 2928774 (1960-03-01), Leisey
patent: 4095176 (1978-06-01), Maes et al.
patent: 4129480 (1978-12-01), Robert
patent: 4343686 (1982-08-01), Hebert, Jr. et al.
patent: 4455200 (1984-06-01), Okamoto
Meek et al., Annodic Dissolution and Selective Etching of Gallium Phosphide, J. Electrochem. Soc. (USA), vol. 119, No. 9.
Crevecoeur Cornelis
De Wit Hendrik J.
Van Berlo Albertus W. M.
Cannon, Jr. James J.
Chapman Terryence
Douglas Winston A.
Haken Jack E.
U.S. Philips Corporation
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