3m Innovative Properties Company

Minnesota Mining and Manufacturing Company

Stanley B Collins

John D Haas

Timothy L Hoopman

Louis D Hibbard

James A Servatius

An abrasive article and methods of making and using the same are disclosed. The abrasive article includes a plurality of features on a backing. The features have a base and a body. The body is defined by sidewalls having parabolic sections. In some embodiments, the sidewalls are defined by a series of inner-connected lines segments approximating a parabolic section.

Structured abrasive with parabolic sides

Method and apparatus for knurling a workpiece, method of molding an

An abrasive article having a sheet-like structure having a major surface and having deployed in a fixed position thereon a plurality of abutting abrasive composites in an area spacing of at least 1,200 composites/cm.sup.2, each of the composites comprising a plurality of abrasive particles dispersed in a binder. The invention also relates to a method for reducing a surface finish of a workpiece surface using the abrasive article and a process for making the abrasive article of the invention.

Abrasive article, a process of making same, and a method of using same

A developer composition capable of developing electrostatic images on dielectric surfaces is disclosed. The composition has an electrical conductivity of at least 10.sup.-6 ohm.sup.-1 centimeter.sup.-1 and utilizes a small dimension powdered material as a coating on the essentially smooth surface of individual spheroids of a toner. The composition reduces background coloration on finished copies and eliminates the need to bias the magnetic development roll.

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White Bear Lake, MN, United States of America

Stanley B Collins