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:
Nov. 16, 1999
Filed:
Sep. 17, 1996
Yoshinori Yamada, Aichi-ken, JP;
Katsuyoshi Harada, Okazaki, JP;
Toagosei Co., Ltd., Tokyo, JP;
Abstract
A solid silica derivative which is represented by the general formula H.sub.n SiO.sub.(4-n)/2 wherein n is a real number larger than 0 but smaller than 2 and which contains Si--H bond, said solid silica derivative being able to be easily produced in a high yield by subjecting to hydrolysis-condensation an alkoxysilane represented by the mean general formula H.sub.n --Si(OR.sup.0).sub.4-n in which R.sup.0 represents an alkyl group having 1 to 4 carbon atoms, plural R.sup.0 groups may be the same as or different from one another and n is a real number greater than 0 but smaller than 2, using water in an amount of (4-n)/2 moles or more per mole of the alkoxysilane at a pH of 10.5 or less.