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:
Jan. 13, 1976
Filed:
May. 30, 1975
Lawrence H Knoell, St. Paul, MN (US);
Hoerner Waldorf Corporation, St. Paul, MN (US);
Abstract
Equipment and process for lining an assembled carton tray made from foldable paperboard or similar material with a thermo-plastic film by use of a vacuum applied in a recessed mold containing the tray. The tray and mold are moved beneath a sheet of film which is heated or a hot sheet of film extruded over the top of the tray. The film must be severed around the edges of the tray after the lining is drawn. A tray may be used with the lid laid back so that the inner facing surface of the lid is also coated with the film. In so doing, a later seal may be formed between the lid and the tray or use of the two films contacting around the edges of the tray.