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:
Jan. 19, 1982
Filed:
May. 19, 1980
Applicant:
Inventor:
Andrew H Wong, St. Paul, MN (US);
Assignee:
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Primary Examiner:
Int. Cl.
CPC ...
B65D / ; B65D / ; B32B / ;
U.S. Cl.
CPC ...
428 35 ; 428335 ; 428336 ; 428339 ; 428355 ; 428480 ; 428910 ; 220260 ; 220359 ;
Abstract
Polyester films consisting of a homogeneous fused, intimate mixture of polyethylene terephthalate (PET) with sufficient polytetramethylene terephthalate (PTMT) to increase film tear strength in excess of 10%. Mixed PET and PTMT resins are extruded and used to produce unoriented, uniaxially oriented, and biaxially oriented polyester films with significantly increased tear strengths. Increased tear strengths are exhibited at different PET-PTMT weight ratios depending upon the orientation of the film.