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:
May. 20, 2003
Filed:
Mar. 08, 2001
Applicant:
Inventor:
Bernd Ludwig, Niederkassel, DE;
Assignee:
Lemo Maschinenbau GmbH, Niederkassel-Mondorf, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23Q 1/600 ; B65H 2/000 ; B65H 2/324 ;
U.S. Cl.
CPC ...
B23Q 1/600 ; B65H 2/000 ; B65H 2/324 ;
Abstract
An apparatus for controlling the web tension in a perforation-welding system for making bags from synthetic resin foil webs in which whistling noises are eliminated by passing the web over a wall of a polygonal duct having an air outlet opening to which compressed air is fed. The air cushion and hence the spacing of the web from the wall is measured by an ultrasonic detector on the opposite of the web.