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. 06, 1980
Filed:
May. 10, 1978
Jan-Erik Olsen, Malmo, SE;
AB Ziristor, Lund, SE;
Abstract
A method of joining two sheets of a laminated thermoplastic material in a joint wherein the edge portion of a first sheet is butted against a face of a second sheet in which an edge portion of the first sheet, which consists of a central layer of porous plastic material such as a foamed polystyrene and compact facing layers of a thermoplastic material such as polystyrene or polythene, is heated by hot air which first causes the edge portion of the central layer to soften and retract followed by softening of the edge portions of the facing layers which then turn inwardly and join together thus closing off the central layer. The edge portion is then butted against and joined to a heated-up compact thermoplastic layer of the second sheet.