Contamination-free magnetic stamper holder

Details Contamination-free magnetic stamper holder Contamination-free magnetic stamper holder

2006-12-19

2006-12-19

Heckenberg, Donald (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

With direct application of magnetic force to manipulate...

C425S19200R, C425S810000, C425SDIG033

Reexamination Certificate

active

07150613

ABSTRACT:
The apparatus is a contamination free stamper holder for molding discs for information storage. The stamper, the disc part of the mold holding the pits and grooves to be formed on the molded plastic, is held within the mold by one or more magnets that are completely enclosed within non-magnetic material. The wall thickness of the enclosing material between the magnets and the stamper is limited so that there is no significant loss in magnetic attraction.

REFERENCES:
patent: 4472124 (1984-09-01), Kashihara et al.
patent: 5552098 (1996-09-01), Kudo et al.
patent: 5612062 (1997-03-01), Takahashi
patent: 5798122 (1998-08-01), Takahashi
patent: 0974442 (2000-01-01), None
patent: 5062252 (1993-03-01), None
patent: 2001-334532 (2004-12-01), None

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