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. 08, 1990
Filed:
Jun. 21, 1989
Applicant:
Inventor:
Ronald Olson, Coon Rapids, MN (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05D / ;
U.S. Cl.
CPC ...
318466 ; 318266 ; 318286 ;
Abstract
An obstruction sensing door reverser attachable to an existing electromechanically operated door opener having existing current carrying stop and open loops; having at least one external obstruction switch disposed in a current carrying loop communicating the presence of the obstruction to the door reverser for stopping movement of the door and further more initiating and holding an open signal on the door operator open loop for predetermined period of time to open the door.