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:
Mar. 07, 1989
Filed:
Sep. 28, 1987
Applicant:
Inventor:
R James Kersting, Houston, TX (US);
Assignee:
Rampart Packaging Inc., Williamsburg, VA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ; B29C / ; B29C / ; B29C / ;
U.S. Cl.
CPC ...
264544 ; 264322 ; 264553 ;
Abstract
A process is disclosed for thermoforming a sheet or billet comprised of at least one outer layer of polypropylene and at least one adjacent layer of a random copolymer of propylene and ethylene and, optionally, a barrier layer. The sheet or billet is thermoformed into rigid articles which do not significantly distort under retort conditions by forming the sheet or billet at a temperature below the sticky point of the polypropylene layer and above the sheet distortion temperature.