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:
Oct. 01, 1996
Filed:
Sep. 11, 1995
James A Kazakoff, Boise, ID (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
Embodiments are shown and described of an electrode biasing scheme and developer design for use with liquid electrophotographic imaging machines. The biasing scheme includes a bi-modal charge transport characteristic, wherein the time constant for reverse-plating is prolonged compared to the time constant for forward-plating. This characteristic may be achieved with a diode between the developer electrode and bias voltage source. The preferred developer design is a micro-developer, having a plurality of electrode micro-regions that each adapt in bias to match the photoconductor voltage profile. The invented developer electrode design significantly reduces the backplating of toner on the electrode surface, and can be used to lengthen the available development time period for a given electrophotographic process.