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:
Aug. 25, 1987
Filed:
Feb. 18, 1986
Applicant:
Inventors:
Gaylon L Dighton, Baton Rouge, LA (US);
Wayne R Hutter, Midland, MI (US);
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B65B / ;
U.S. Cl.
CPC ...
53469 ; 53479 ; 5326 / ;
Abstract
The invention is a method and machine for filling and sealing a multiwall valve bag. The bag is fabricated with a valve structure that has at least two separated layers of a polymer composition capable of being heated by electromagnetic energy in the radio frequency range (RF energy). After the bag is filled with a product, the valve structure of the bag is clamped against a set of electrodes that are carrying the RF energy. In a very short time, the polymer layers in the valve structure will absorb enough of the RF energy to join together and thus 'heat' seal the filled bag.