Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1983-02-28
1984-05-01
Williams, Howard S.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204 5, 204297R, 204297W, C25D 110, C25B 1708
Patent
active
044459955
ABSTRACT:
An improved cathode head is provided for use in the matrixing of masters, molds and stampers for use in the manufacture of molded records and discs. The cathode head of this invention has a disc shaped member on which a matrix to be replicated is to be mounted and an outer threaded ring which is screwed on the outer edge of the disc member to secure the outer edge of a matrix to be replicated to the surface of the disc shaped member. It has been found in accordance with this invention that the seal formed at the outer edge between the ring member, the matrix replicated and the disc shaped member can be substantially improved as compared to that of a prior art cathode head by using a seal having a right triangular shaped lead section which, in addition to providing a substantially improved electrolyte seal disc, allows the replica to be formed having a perpendicular outer edge.
REFERENCES:
patent: 2018471 (1935-10-01), Russell
patent: 2675348 (1954-04-01), Greenspan
patent: 2890160 (1959-06-01), Hunting et al.
patent: 3414502 (1968-12-01), Porrata et al.
patent: 4259166 (1981-03-01), Whitehurst
patent: 4341613 (1982-06-01), Prusak et al.
patent: 4364816 (1982-12-01), Birt
patent: 4385978 (1983-05-01), Prusak
Morris Birgit E.
RCA Corporation
Sites Edward J.
Williams Howard S.
Williams T.
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