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. 14, 1992
Filed:
Jun. 05, 1990
Applicant:
Inventors:
David W Mitchell, Midland, MI (US);
Roger D Vrooman, Midland, MI (US);
Assignee:
Dow Brands Inc., Indianapolis, IN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B31B / ;
U.S. Cl.
CPC ...
493195 ; 493189 ; 1563084 ;
Abstract
An improved method of making a stand-up plastic bag in which the side seam seals are formed at the same time as the gusset wall seals. The method includes the steps of supplying the film, folding the film to form the gusset, simultaneously forming the heat seals for the gusset walls and the side seams at one temperature, forming the heat seals to join the gusset walls together at a higher temperature, and separating the film into completed bags. The improved method provides greater efficiency and increased production rates.