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:
Feb. 04, 1992
Filed:
Feb. 15, 1990
Daniel P McDonald, Arlington Heights, IL (US);
Zip-Pak Incorporated, Northbrook, IL (US);
Abstract
A method of forming a series of tray containers from plastic sheet film including intermittently continuously advancing a sheet of film, forming pockets in the film by heating and pressure differential across the film, laterally delivering closure strips between the pockets with the closure strips doubled, and having upper and lower layers with rib and groove fastener profiles therebetween, attaching the lower layer of the fastener to the web at the upper and lower edges of the fastener, laying an upper layer of film over the lower layer and attaching it to the lower layer around the edges of the pockets and attaching the upper layer of film to the top edge of the doubled fastener strip with the upper layer of the fastener strip having a tear perforation sealed by a sealing strip below the rib and groove elements.