Minnesota Mining and Manufacturing Company

Richard L Miklos

Craig F Lamphere

A method of forming a magnetic disk and jacket assembly and the jacket formed thereby. The jacket is formed from a precut sheet of material which is scored or perforated at the midpoint of its length to define a top panel and a bottom panel and around the edges of the bottom panel to define three flaps. The flaps are folded over and adhesively attached to the bottom panel to form a spacer surrounding an adhesive-free circular interior area and defining a central cylindrical cavity. After insertion of a magnetic disk into the cavity, the top panel is folded over and adhesively attached to the spacer. The three edges connecting the spacer and the bottom panel are trimmed to size to complete the assembly.

Magnetic disk jacket and forming process

A magnetic disk jacket which encloses and protects a magnetic disk is rendered duplication resistant by hot-stamp transfer printing an area of the jacket which cannot be supported in a flat or planar condition against the application of pressure after the jacket has been at least partially assembled, hot-stamp transfer printing an area of the jacket which extends across a portion of the jacket which is to be folded at assembly, or embossing an area of the jacket which will be superposed over a panel of the partially assembled disk jacket. The printed or embossed area may also identify information which should be present on the disk.

Non-dublicable magnetic disk jacket and method of manufacture

Magnetic recording diskette has as the wiping fabric a flocked-fiber layer. While prior diskettes have required individual pieces of wiping fabric to be adhered to individual sheets of jacket material, the flocked-fiber layer can be applied to a roll of the jacket material continuously to provide roll stock from which individual jacket blanks can be die-cut.

Recording diskette having flocked-fiber wiping fabric

Improved reflective sense marker less than 2.5 micrometers in thickness including (a) a reflective thin-film metal coating, (b) a thin layer of adhesive bonding the thin-film coating to the back side of a magnetic recording tape, and (c) a thin, tough, abrasion-resistant transparent polymeric protective layer such as a copolymer of ethylene and vinyl acetate covering the thin-film coating.

Growing community of inventors

Afton, MN, United States of America

Richard L Miklos