Eastman-kodak Company

Bradford D West

Robert O James

Neil Smith

Frederick J Jeffers

Mary-Irene E Condo

Ronald Myron Wexler

William H Simpson

Lawrence A Rowley

Frederick Rockwell Chamberlain, Iv

Steven J Adamson

Lee Walter

Frederick R Chamberlain

Tomasz Mark Jagielinski

Greg A Burg

A particulate magnetic recording media wherein the magnetic particles are substantially spherical. The spherical particle shape makes possible a media which is magnetically isotropic, well dispersed and low in noise, and free of magnetically inferior broken particles.

Spherical magnetic particles for magnetic recording media

A method of making a magnetically encodable card which comprises forming a dispersion of ferromagnetic particles in an organic fluid medium, forming a composite by intimately combining the dispersion with a thermoplastic resin plasticized by the organic fluid medium and forming the composite into an encodable card.

Method of making a magnetically encodable card having magnetic particles uniformly distributed throughout

Protective inorganic and DLC coatings for plastic media such as plastic

An identification card comprising a card stock comprising a plastic material having magnetic particles uniformly dispersed throughout, the card stock also having an image-receiving layer located on the outermost surface of at least one side of the card stock, the image-receiving layer comprising a polycarbonate having a Tg of less than about 80.degree. C.

Thermal dye transfer magnetic ID card

A credit and access control card and reader system comprising: a magnetically encodable card comprising a body having upper and lower surfaces and side and end edges, the body being formed of plastic material having magnetic particles uniformly dispersed throughout the plastic material; and a reader having a magneto resistive (MR) head for reading the magnetically encodable card as it is moved past the MR head.

Magnetic card and reader system

There is disclosed a magnetic head particularly suited for high frequency applications. The head has a ceramic body of a new ceramic material which provides longer service life together with a high level of operating efficiency and cost effectiveness. The head includes a core of magnetic material, such as thin layers of the metal FeAlSi, bonded to pieces of the ceramic material. The coefficients of thermal expansion of the ceramic and the core are suitably matched to permit wide temperature excursions (e.g., 500.degree. C.) during manufacture of the head. The ceramic is a matrix of a material such as a metal titanate in which are distributed hard inclusions such as a metal oxide which are tightly bound to the matrix to preclude pull out of the inclusions during machining of the ceramic. The wear resistance and other characteristics of the magnetic head are greatly improved compared to a comparable head made with manganese nickel oxide ceramic, for example.

Magnetic record/reproduce head having improved service life, and new

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La Jolla, CA, United States of America

Bradford D West