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:
Apr. 28, 1981
Filed:
Jun. 20, 1979
Applicant:
Inventor:
Gyula Balla, Malmo, SE;
Assignee:
Tetra Pak International AB, Lund, SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428195 ; 156275 ; 428198 ; 428200 ; 428201 ; 428204 ; 428206 ; 428211 ; 428408 ; 428537 ; 428913 ; 428688 ;
Abstract
A sealable laminated material which consists of an outer thermoplastic layer with a lamination layer arranged adjoining the said layer containing fine-grain carbon material, so-called carbon black, and a binder. The laminated material moreover may contain a carrier layer of e.g. paper, cardboard or plastic material. The outer thermoplastic layer of the laminated material which is intended to act as a sealing layer, can be heated up to sealing temperature in that heat is generated in the adjoining layer containing powdered coal when the latter is subjected to the effect of a high-frequency electric field.