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:
Sep. 18, 2012
Filed:
Sep. 25, 2009
Applicant:
Friedhelm Frede, Erwitte, DE;
Inventor:
Friedhelm Frede, Erwitte, DE;
Assignee:
Assa Abloy Entrance Systems AB, Landskrona, SE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E05F 13/00 (2006.01); E05F 15/00 (2006.01); A47G 5/02 (2006.01); A47H 3/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A counterbalance system for a rollup door system having a drum in which the counterbalance provides a counter force acting at a distance from the center of rotation of the drum. The counter force is variable in both direction and magnitude at various angular positions of the drum.