The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 21, 1995
Filed:
Apr. 30, 1993
Boris J Katsen, Longmeadow, MA (US);
Dene H Taylor, Holyoke, MA (US);
Richard S Himmelwright, Wilbraham, MA (US);
Cynthia F Klausner, Hadley, MA (US);
Edward W Sporbert, Chicapee, MA (US);
Barbara J Stewart, Springfield, MA (US);
John Cavanaugh, Easthampton, MA (US);
Eran Turi, Springfield, MA (US);
Rexham Graphics Inc., South Hadley, MA (US);
Abstract
Provided is a composite material comprising a carrier, a conductive layer formed on the carrier, and a dielectric layer containing spacer particles formed on the conductive layer. The dielectric layer has an abrasion factor less than about 0.3 determined by a brass shim abrasion method, and a substantially uniform distribution of spacer particles substantially free of flat spots greater than about 100 microns in the x-y direction and 1500 square microns in area on any part of the surface. The spacer particles of the dielectric layer of the composite material preferably are amorphous silica. The composite material is useful in electrostatic imaging technology and provides images substantially free of defects, including artifacts or flares, dropouts and nib writing. Also provided is a process which permits the creation of very stable dispersions of solid particles in a dispersing medium useful for both the dielectric and conductive layers of the composite material of the invention. A white or colored conductive ground plane is also provided.