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:
Jun. 14, 1977
Filed:
Jun. 11, 1975
Applicant:
Inventors:
Eric W Vessey, Springfield, PA (US);
James R Miller, Rancho La Costa, CA (US);
Klaus Robert Lange, Huntingdon Valley, PA (US);
Assignee:
Philadephia Quartz Company, Valley Forge, PA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09C / ;
U.S. Cl.
CPC ...
1062 / ; 423339 ; 423335 ; 1063 / ; 428403 ; 428404 ;
Abstract
Microfine silicas that are useful as rubber reinforcing fillers and thickening agents, and are readily dispersible are prepared by modifying the surface layer of the silica. The surface modification results from including in or affixing to the surface of the silica certain inorganic polyvalent ions.