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. 21, 1990
Filed:
Sep. 22, 1988
Applicant:
Inventors:
Dwight E Williams, Midland, MI (US);
Thomas J Tangney, Midland, MI (US);
Assignee:
Dow Corning Corporation, Midland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01J / ; B01J / ; B01D / ; B32B / ;
U.S. Cl.
CPC ...
502401 ; 55386 ; 2101982 ; 2101983 ; 210656 ; 427387 ; 428405 ;
Abstract
Dual zone porous materials having an external zone and an internal zone are prepared by contacting a suspension of a porous support, such as particulate silica, in an aprotic solvent with an organosilane mixture of a first organosilane having first silyl groups and a second organosilane of a second type in order to form first silyl groups predominantly or the external surfaces of the porous support and second silyl groups predominantly on the internal surfaces of the porous support.