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:
Sep. 28, 1976
Filed:
Jul. 30, 1974
John M Vandling, Pleasantville, NY (US);
Exxon Research and Engineering Company, Linden, NJ (US);
Abstract
A document/copy carrying drum of a facsimile transceiver is rotatably driven by a synchronous motor. The synchronous motor is connected as a load in series with a first transistor and a first power supply of one polarity. The synchronous motor is also connected in series with a second circuit and a second power supply of opposite polarity so as to apply DC voltages of opposite polarity during alternate conduction of the transistors. Conduction of the transistors is controlled by alternately applying a series of relatively low voltage pulses to the bases of the transistors through high frequency isolation transformers. The pulses are separated by a time interval less than the base storage time of the transistors so as to assure continuous conduction between the collector and emitter of a transistor while a series of pulses is applied to the base thereof.