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. 24, 2014
Filed:
Dec. 21, 2005
Applicants:
Larry Yen, Andover, MA (US);
Rajnikant B. Patel, Tewksbury, MA (US);
Inventors:
Larry Yen, Andover, MA (US);
Rajnikant B. Patel, Tewksbury, MA (US);
Assignee:
Entegris, Inc., Billerica, MA (US);
Primary Examiner:
Int. Cl.
CPC ...
B32B 7/02 (2006.01); B32B 27/32 (2006.01); B32B 3/26 (2006.01); C08L 23/06 (2006.01);
U.S. Cl.
CPC ...
Abstract
A multilayer porous membrane formed of an extrudable polymer is provided. The membrane is formed by co-extruding at least two compositions, each of which comprises a heated porogen and polymer while in contact with each other under conditions to minimize or prevent unstable interfacial flow between extruded layers. In a preferred embodiment, the two compositions are different such that the layers have a different average pore size.