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:
Aug. 25, 1987
Filed:
Nov. 12, 1986
Hiroshi Ishikawa, Kawasaki, JP;
Kiyohisa Yoshigae, Kawasaki, JP;
Fuji Electric Co., Ltd., Kawasaki, JP;
Abstract
An electrical fuse having an element which includes a strip of conductive metal connectable to the fuse terminals, the strip of conductive material having a plurality of holes through its thickness dimension spaced along the center line of its width, successive ones of the holes through the strip each having a slot joining that hole with an opposite one of the edges from the edge joined by the adjacent hole and its associated slot, the spacing of the holes and their associated slots being such that the current flowing through the fuse element is forced to zig-zag through regions which constrict the current and successive regions which have broad area and volume so that undesired abnormally high temperature rises within the fusing element, which might arise with ordinary over-loads which are not destructive and would cause unnecessary opening of the fuse element, are prevented, while, at the same time, the sensitivity of the fuse element to destructive current surges is retained and, if necessary, fusing time in low current regions of operation is enhanced by plating on the surface of the conductive strip a metal of low-melting-point which will form a eutectic with the base material of the strip to reduce the melting temperature of the fuse strip when it is operating in the low current regions and faces a sudden and destructive surge of electrical current, the combination having mechanical strength as well as improved electrical characteristics.