Minnesota Mining and Manufacturing Company

Richard L Jacobson

John W Louks

Roger K Westerberg

Randy A Hoff

Frank R Jeffrey

Timothy T Lin

John D Holm

Ronald E Smith

Gerald S Anderson

A method of forming apertures generally greater than about 0.05 square millimeters in a thin sheet material. The thin sheet material includes a first side and a second side at least one side of the thin sheet material is substantially coated with an adhesive. The method comprises the steps of (a) placing the adhesive-coated thin sheet material on a patterned anvil having a pattern of raised areas wherein the height of the raised areas is equal to or less than the thickness of the thin sheet material and the adhesive; and (b) subjecting the thin sheet material to a sufficient amount of sonic vibrations to aperture the thin sheet material and the adhesive; and whereby the thin sheet material and the adhesive is apertured in a pattern generally the same as the pattern of raised areas on the patterned anvil.

Method of aperturing thin sheet materials

A system for the simultaneous deposition of different coatings onto a thin web within a large volume vacuum chamber is disclosed which chamber is provided with a plurality of deposition chambers in which the different layers are deposited onto the film as its moves from a supply roll to a finished take-up roll of coated web. The deposition chambers provided within the large vacuum chamber are provided with separate seals which minimize back diffusion of any dopant gas from adjacent deposition chambers.

Multi-chamber deposition system

A composite dual layered photoreceptor member useful in the field of electrostatic electrophotography. The photoreceptor has a support member with a bulk layer on the support member of vitreous selenium-tellurium composition and a thin overlayer of vitreous arsenic-selenium composition. The selenium-tellurium can, if desired, be doped with a halogen.

Two-layered photoreceptor containing a selenium-tellurium layer and an

Magnetic recording medium having a binder-free magnetizable coating of M.sub.2 P where M consists essentially of a combination of at least two transition metals, preferably iron, nickel and/or cobalt, which medium has high coercivity and low Curie temperature, making it especially useful as an intermediate transfer medium for thermoremanent contact duplication.

Growing community of inventors

Roseville, MN, United States of America

Richard L Jacobson