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:
Dec. 21, 1993
Filed:
Feb. 06, 1990
Hideyuki Motoori, Yokohama, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
The present invention relates to a surge protector for suppressing a surge voltage generated on transmission lines, having an object to prevent system shut-down by grounding detected by terminal equipment at the time of suppressing a surge, using a discharge tube for suppressing intermittently a surge voltage. The surge protector of the present invention comprises a first suppressing means comprising a penta-electrode discharge tube having first positive and negative electrodes and second positive and negative electrodes, any one of which is operatively connected to first input terminals and to a grounded grid electrode; a switch means one end of which is operatively connected to the first positive electrode or negative electrode and the other end to said second input electrode; and an ON-OFF switch control means which is operatively connected to said second positive and negative terminals to control the ON-OFF operations of said switch means; and a second suppressing means comprising first and second resistor means connected respectively in series to said transmission lines and a metal oxide varister which is connected in parallel with said transmission lines to suppress a surge voltage by converting it into heat.