Flexible magnetic disk and method of making same

Details Flexible magnetic disk and method of making same Flexible magnetic disk and method of making same

1985-11-06

1987-10-13

Robinson, Ellis P.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

427 44, 427 541, 427128, 427131, 427132, 427289, 428137, 428195, 428212, 428694, 428695, 428900, G11B 572

Patent

active

046998357

ABSTRACT:
A flexible magnetic disk is provided with a protective layer at the peripheral edge portion of the circular hole in the center of a magnetic disk sheet. The protective layer is formed by applying a radiation-polymerizable composition to the peripheral edge portion of the circular hole in the center of the magnetic disk sheet by letterpress printing, and exposing the composition to a radiation to cure the composition.

REFERENCES:
patent: 3466156 (1969-09-01), Peters
patent: 3681225 (1972-08-01), Genma
patent: 4239828 (1980-12-01), Knope
patent: 4335183 (1982-06-01), Hosaka
patent: 4368239 (1983-01-01), Nakajima
patent: 4387114 (1983-07-01), Conner
patent: 4404247 (1983-09-01), Dominquez-Burquette
patent: 4434210 (1984-02-01), Nakajima
patent: 4486500 (1984-12-01), Naruo
patent: 4523246 (1985-06-01), Okuzawa
patent: 4539220 (1985-09-01), Martinelli
patent: 4578299 (1986-03-01), Kato
patent: 4581270 (1986-04-01), Kato
patent: 4647473 (1987-03-01), Kato
patent: 4652480 (1987-03-01), Kato

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