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:
Aug. 30, 1977
Filed:
Apr. 20, 1976
Jar-Erik Jofs, Vasa, SF;
Oy Wiik & Hoglund Ab, , SF;
Abstract
A method of making a non-slip plastic film comprises extruding separate plasticized plastic materials in two streams so that one stream abuts against and adheres to the other to form a combined plastic layer. The combined plastic layer is then stretched by directing air centrally into a tubular formation of this layer. One of the plastic materials comprises a material having an expanding agent or a foaming agent and the stretching causes the breaking of the voids of the foam plastic to form a rough, irregular net-like formation on the exterior of the other plastic. The apparatus includes two separate nozzles arranged to extrude plastic material so as to intersect and form a combined plastic.