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:
Aug. 18, 1998
Filed:
Oct. 17, 1995
Gary Hanson, Meridian, ID (US);
C S Chan, Boise, ID (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
An electrostatic printing apparatus includes a rotating transfer drum having an outer transfer surface. A plurality of direct toner projection units are positioned adjacent the transfer surface of the rotating transfer drum to project toner patterns of different colors onto the transfer surface in response to modulated signals. After the patterns are applied to the drum, they are transferred to paper and fused. The drum is constructed of two components: a base layer or core which is conductive, and a surface layer which is chosen primarily for its surface properties. The surface layer is conductive enough to allow toner particles to dissipate their electrical charges before additional toner is applied by downstream toner projection units.