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. 30, 1999
Filed:
Apr. 29, 1997
Philip D Radovanovic, Minneapolis, MN (US);
Gari P Krogseng, St. Paul, MN (US);
Clinton P Waller, Jr, White Bear Lake, MN (US);
James S Mrozinski, Oakdale, MN (US);
Dennis L Krueger, Hudson, WI (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A single or multi-layer microporous material of which at least one layer contains a compatible, melt-processible polymer mixture having a first polymer component with a melting point greater than 140.degree. C. and a second polymer component having a melting point lower than 120.degree. C. is described as well as a method of preparing the material. The first polymer component and the second polymer component are miscible in a compound or compatible liquid when heated above the melting temperature of the first polymer component or above the liquid--liquid phase separation temperature and phase separate from the compound or compatible liquid when cooled. The materials are particularly useful as battery separators.