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:
Mar. 17, 1981
Filed:
Dec. 26, 1978
Shigeru Kawamata, Ibaraki, JP;
Kiyoshi Tsukuda, Ibaraki, JP;
Hitachi, Ltd., , JP;
Abstract
In a semiconductor switch for use in a telephone exchange, interference between separate switching units located on a single chip is frequently a problem. To overcome this, a semiconductor switch is provided with a plurality of islands of silicon monocrystal disposed in a supporting body of silicon polycrystal through a dielectric film having a plurality of switching circuit islands, at least one driving circuit island, and a plurality of protective circuit islands, wherein a region to reduce parasitic capacitance is formed between said switching circuit islands by arranging the switching circuit islands to be isolated from one another through said region.