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:
May. 05, 1981
Filed:
Oct. 18, 1979
Applicant:
Inventor:
Brian L Hetherington, Kingston, CA;
Assignee:
Du Pont Canada, Inc., Montreal, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F27B / ;
U.S. Cl.
CPC ...
432-8 ; 219384 ; 219388 ;
Abstract
A continuous process for forming a longitudinal heat-weakened strip in a cross-lapped oriented polyolefin film is disclosed. The process comprises directing heat from two longitudinally aligned sources, to opposing sides of a travelling web of the cross-lapped oriented polyolefin film, to such an extent that the tensile breaking strength at the heat-weakened strip so formed is in the range of 20 to 100 Newtons per centimeter of length of film. The film so formed is particularly useful for packaging slurry explosives.