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. 30, 1997
Filed:
Dec. 21, 1995
Atsuo Tokunaga, Hadano, JP;
Masahide Nakaya, Chigasaki, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A first power source for providing a positive voltage and a second power source for providing a negative voltage are selectively activated to supply a positive or a negative voltage to a load. A rectifying element is connected between the first and second power sources to prevent electric current from flowing through the second power source when only the first power source is active. A switch and a resistor for generating a feedback current are connected in series with an output terminal of the first power source and a terminal of the load. The switch is opened to prevent current flow through the resistor when only the second power supply is active.