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. 14, 1990
Filed:
Sep. 20, 1988
Hirotoshi Watanabe, Osaka, JP;
Toru Ishida, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A resistor composition containing no boride powder is obtained by mechanical grinding of at least one of silicon, silicon monoxide and higher oxidation state precursor of silicon monoxide; and a borosilicate glass containing at least one of zirconium oxide, vanadium pentoxide, chromium oxide, tungsten trioxide, molybdenum trioxide, manganese oxide, titanium oxide, niobium pentoxide and tantalum pentoxide, which are capable of being reduced with silicon, silicon monoxide or higher oxidation state precursor of silicon monoxide. In a sintering step in a non-oxidizing atmosphere, boron oxide and at least one another oxide contained in the borosilicate glass are reduced by silicon, silicon monoxide, higher oxidation state precursor of silicon monoxide or silicide, and metal elements of the oxides contained in the glass combine with each other, so that fine particles of boride are precipitated around glass particles to form a graze resistor.