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. 15, 1982
Filed:
Jun. 25, 1981
Applicant:
Inventor:
Stanley B Levy, Wilmington, DE (US);
Assignee:
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
2642902 ;
Abstract
A balanced, biaxially oriented polyolefin shrink film is produced using a tenter process by heating the film, stretching the film 7 to 10 times in the transverse direction, cooling the film and then heating and stretching the film 1.5 to 4 times in the longitudinal direction such that the ratio of the transverse stretch to the longitudinal stretch is greater than 2.0.