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:
Feb. 20, 2018
Filed:
Mar. 19, 2010
Richard W. Pekala, Corvallis, OR (US);
Srinivas Cherukupalli, Saidabad, IN;
Robert R. Waterhouse, Scio, OR (US);
Richard W. Pekala, Corvallis, OR (US);
Srinivas Cherukupalli, Saidabad, IN;
Robert R. Waterhouse, Scio, OR (US);
Amtek Research International LLC, Lebanon, OR (US);
Abstract
Preferred embodiments of a freestanding, heat resistant microporous polymer film () constructed for use in an energy storage device () implements one or more of the following approaches to exhibit excellent high temperature mechanical and dimensional stability: incorporation into a porous polyolefin film of sufficiently high loading levels of inorganic or ceramic filler material () to maintain porosity () and achieve low thermal shrinkage; use of crosslinkable polyethylene to contribute to crosslinking the polymer matrix () in a highly inorganic material-filled polyolefin film; and heat treating or annealing of biaxially oriented, highly inorganic material-filled polyolefin film above the melting point temperature of the polymer matrix to reduce residual stress while maintaining high porosity. The freestanding, heat resistant microporous polymer film embodiments exhibit extremely low resistance, as evidenced by MacMullin numbers of less than 4.5.