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:
Dec. 21, 1999
Filed:
Dec. 17, 1998
Chee-Chiu J Wong, Fairport, NY (US);
Peter G Fournia, Penfield, NY (US);
Xerox Corporation, Stamford, CT (US);
Abstract
A method of achieving pure tone noise control in a charging system of a copier/printer. The method includes the steps of first providing a plurality of individual charging devices and providing a plurality of power supplies for charging the plurality of individual charging devices. Next, charging at least one of the plurality of individual charging devices with a first of the plurality of power supplies at a predetermined frequency and charging at least one of the plurality of individual charging devices with a second of the plurality of power supplies at a frequency different from, but within a band width of, the predetermined frequency; and, lastly, charging at least one of the plurality of individual charging devices with a third of the plurality of power supplies at a frequency different from that of the first and second power supplies and within the band width of the first power supply frequency.