Process for removal of magnetic coatings from computer memory di

Details Process for removal of magnetic coatings from computer memory di Process for removal of magnetic coatings from computer memory di

1981-07-06

1984-03-27

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

2041297, 20412975, 134 3, 134 28, 134 38, 156668, 252 792, C25F 500, C23G 102, B29C 1708, C09K 1304

Patent

active

044392893

ABSTRACT:
Removal of magnetic coatings from computer memory discs is achieved by immersing the discs in a bath of a sulphuric-acid and glycerine solution while applying an electrical potential between electrodes in the bath, one of which is the disc itself. After removal of the disc from the sulphuric-acid glycerine solution, it is sequentially immersed in alcohol and then water; any remaining coating is next mechanically removed and then the disc is immersed in high purity water and dried.

REFERENCES:
patent: 2840521 (1958-06-01), Wasserman
patent: 3767491 (1973-10-01), Chough
patent: 3954648 (1976-05-01), Belcak et al.
patent: 3962108 (1976-06-01), Perruccio
patent: 3993804 (1976-11-01), McCready et al.
patent: 4169026 (1979-09-01), Kikuchi et al.
patent: 4304681 (1981-12-01), Martin et al.

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