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:
Jun. 07, 1977
Filed:
Oct. 20, 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 by an oscillating circuit. 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. A control circuit senses the desired corona voltage and operates to inhibit passage of oscillations from the oscillating circuit to the pulse shaping circuit in order to minimize power consumption.