Chemistry: electrical and wave energy – Processes and products
Patent
1988-02-01
1989-05-30
Tufariello, T. M.
Chemistry: electrical and wave energy
Processes and products
C25D 110
Patent
active
048348430
ABSTRACT:
In a method of marking optically readable disc-shaped information carriers which are manufactured, for example, by a transfer-moulding process using at least one mould serving as a stamper, which mould has been derived from a master via at least two electroforming replication steps, the mould is provided with a marking for the subsequent indentification of the mould, which marking is situated in an otherwise information-free area of the information carrier to be manufactured and allows the mould thus marked to be identified.
REFERENCES:
patent: 1011838 (1911-12-01), Owen
Koop Hermann
Schuddekopf Hans
Spain Norman N.
Tufariello T. M.
U.S. Philips Corporation
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