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:
Jan. 25, 1983
Filed:
May. 28, 1981
Applicant:
Inventor:
Yoh Matsushita, Tokyo, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B / ; H01H / ;
U.S. Cl.
CPC ...
307140 ; 3403 / ;
Abstract
An AC switching device includes a switch element associated with the primary side of a transformer so that the switching element is turned on or off always at a zero-crossing point where the alternating current shifts from predetermined one of the positive and negative phases to the other. The switching element is turned off at a zero-crossing point which occurs immediately after the arrival of a turn-off command signal while it is turned on at a zero-crossing point which occurs after the arrival of a turn-on command and at the same phase of the alternating current as the turn-off phase.