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:
Jul. 14, 1998
Filed:
Nov. 25, 1996
Patrick N Kocher, Greer, SC (US);
W. R. Grace & Co.-Conn., Duncan, SC (US);
Abstract
A method of making a peelable film comprises providing a multilayer film; delaminating the film into a first portion and a second portion; treating the second portion to increase its gas permeability; and relaminating the treated second portion to the first portion. In another aspect of the invention, an apparatus for making a peelable film comprises a means for delaminating a film into a first portion and a second portion; a means for treating the second portion to increase its gas permeability; and a means for relaminating the treated second portion to the first portion. Perforations, partial perforations, and other film treatments can be thus advantageously utilized in connection with a second, preferably gas permeable portion of a peelable film, without affecting a first, preferably gas impermeable portion of the same film.