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. 12, 1976
Filed:
Nov. 07, 1975
Harold J Weber, Sherborn, MA (US);
Coulter Information Systems, Inc., Bedford, MA (US);
Abstract
A portable power supply circuit for supplying a high voltage corona in a portable electrophotographic apparatus. An A.C. signal comprising a series of pulses is produced for a predetermined period of time. The pulses are shaped by a shaping circuit which draws current during only a portion of the operating cycle. These pulses are coupled through a step-up transformer to a multiplying circuit which multiplies the voltage at its input to the desired corona voltage. The power supply circuit includes a portable source of D.C. voltage such as a dry cell battery which supplies the necessary current and voltage. The power supply circuit is designed also to provide a number of D.C. bias voltages of polarity opposite to the corona voltage.