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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.:

US 4943425 B1

PDFFull Text
Date of Patent:
Jul. 24, 1990

Filed:

Apr. 01, 1988

Method of making high purity dense silica of large particle size

Applicant:
Inventors:

Sophia R Su, Weston, MA (US);

Leo F Fitzpatrick, Sandwich, MA (US);

Assignee:

GTE Laboratories Incorporated, Waltham, MA (US);

Attorneys:

Craig; Frances P.

Ericson; Ivan L.

Primary Examiner:

Robert L Stoll

Assistant Examiner:

Lori F Cuomo

Int. Cl.
CPC ...
C01B / ;
U.S. Cl.
CPC ...
423338 ; 423339 ;
Abstract

A method of making high purity, dense silica of large particles size is described. Tetraethylorthosilicate is mixed with ethanol and is added to a dilute acid solution having a pH of about 2.25. The resulting solution is digested for about 5 hours, then 2N ammonium hydroxide is added to form a gel at a pH of 8.5. The gel is screened through an 18-20 mesh screen, vacuum baked, calcined in an oxygen atmosphere and finally heated to about 1200.degree. C. in air to form a large particle size, high purity, dense silica.

Find Patent Forward Citations

Su, Sophia. (1990). Method of making high purity dense silica of large particle size (U.S. Patent No. 4943425). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4943425

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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