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:
Mar. 19, 2002
Filed:
Nov. 13, 1998
Chiu Ping Wong, Vadnais Heights, MN (US);
Thomas P. Hanschen, St. Paul, MN (US);
Anthony B. Ferguson, Lake Elmo, MN (US);
William W. Merrill, White Bear Lake, MN (US);
Fred J. Roska, Woodbury, MN (US);
Jeffery N. Jackson, Woodbury, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A method of biaxially stretching a polymeric film along an overbias stretch profile having the steps of (a) imparting a sufficiently high temperature to the film to allow a significant amount of biaxial stretch; and (b) biaxial tenter stretching the film to a final first direction stretch parameter and a final second direction stretch parameter, wherein at least 75% of the final first direction stretch parameter is attained before no more than 50% of the final second direction stretch parameter is attained, and wherein the final first direction stretch parameter is no greater than the final second direction stretch parameter.