Paper bags having leak-proof seams

• US 3,358,903 A
• Filed: 03/31/1966
• Issued: 12/19/1967
• Est. Priority Date: 03/31/1966
• Status: Expired due to Term

• Current Assignee: Lokey, Burke P., Patrick J De Stefano
• Original Assignee: Lokey, Burke P., Patrick J De Stefano
• Inventors: DE STEFANO PATRICK J, Lokey, Burke P.
• Application Number:
  US04/539,036
• Time in Patent Office: 628 Days
• US Class Current: 383/108
• CPC Class Codes: B65D 31/005 by folding a single blank to U-shape to form the base of the bag and opposite sides of the body-portion, the remaining sides being formed by extensions of one or more of these opposite sides cartons B65D5/18
• CPC Class Codes: B65D 31/10 with gusseted sides

Claims

1. A PAPER BAG WITH A LEAK-PROOF CAPABILITY THAT HAS A SEAMLESS BOTTOM AND A LEAK-PROOF COMPOUND SEAM ALONG EACH SIDE, EACH COMPOUND SEAM COMPRISING:

(A) A PRIMARY SEAM OF PEEL-JOUNT TYPE THAT IS FORMED BY ADHESIVELY CONJOINING THE EDGES OF OPPOSED BAG WALLS, THE ADHESIVE BEING EXPOSED TO THE INTERIOR OF THE BAG AND THE SEAM BEING PROTECTED FROM TRANSVERSELY APPLIED LOADS, AND (B) A SECONDARY SEAM OF SHEAR-JOINT TYPE THAT IS PARALLEL TO THE PRIMARY SEAM AND IS FORMED BY ADHESIVE JUNCTURE WITH A BAG WALL ON THE TENSION SIDE OF THE PRIMARY SEAM, THE ADHESIVE BEING SHIELDED FROM THE INTERIOR OF THE BAG BY THE PRIMARY SEAM, SAID SECONDARY SEAM BEING CAPABLE OF FUNCTIONING AS A SECONDARY LEAKAGE BARRIER AND OF ENTIRELY SUSTAINING TRANSVERSELY APPLIED LOADS.