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:
Apr. 18, 1978
Filed:
Jan. 16, 1975
Applicant:
Inventor:
George I Rucker, Dublin, CA (US);
Assignee:
Crown Zellerbach Corporation, San Francisco, CA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29D / ; B32B / ;
U.S. Cl.
CPC ...
156466 ; 5318 / ; 138151 ; 138156 ; 138170 ; 156555 ; 156583 ;
Abstract
A conventional fin-type seam formed on tubed bag forming sheet material provided on one face with heat sealable material, has heat sealed overlapping edge portions forming the seam. The fin slides over a back-up plate extending between it and the body of the tube to prevent scuffing of the heat sealable material with consequent seal failure. A tracking wheel engaging the fin presses it against the back-up plate, and maintains alignment.