Method for defacing compact discs

Details Method for defacing compact discs Method for defacing compact discs

1994-02-02

1996-05-28

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming sound grooves in records

264162, 264293, 425385, 425810, B29C 5900

Patent

active

055208657

ABSTRACT:
A system for defacing compact discs so as destroy information stored thereon includes a defacer unit and a feed unit for feeding discs one at a time, with vertical orientation, to the defacer unit. A falling vertically-oriented disc is caught and held between two sets of driven endless rubber belts which transport the disc between opposed knurling wheels which embed grooves in opposite sides of the disc substrate without, however, cracking the substrate. The knurling wheels are designed to give the grooves an identifiable pattern.

REFERENCES:
patent: 2265032 (1941-12-01), Feyrer
patent: 2611927 (1952-09-01), Roberts et al.
patent: 2633050 (1953-12-01), Helm, Jr.
patent: 4645701 (1987-02-01), Zarrow
patent: 4931770 (1990-06-01), Abramson
patent: 5220754 (1992-06-01), Tayebi et al.
Pat. Abs. of JP, vol. 17, No. 650 (P-1652), Feb. 12, 1993 & JP-A-05 210 873 (Sony Corp.) Aug. 20, 1993--Abstract.
Pat. Abs. of JP, vol. 15, No. 322 (P-1239) Aug. 16, 1991 & JP-A-03 116 506 (NEC Corp.), May 17, 1991--Abstract.

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