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:
Nov. 12, 1991
Filed:
Nov. 19, 1990
George Frolov, Farmington, CT (US);
Gary Lavelle, Avon, CT (US);
James J Scott, New Britian, CT (US);
Harrow Products, Inc., Grand Rapids, MI (US);
Abstract
An exit door security system which employs an electromagnet and armature to lock an exit door comprises an electromagnetic housing and a frame assembly. The housing is pivotally mounted to the frame assembly. An attempt to exit the door causes the housing to pivot to thereby actuate a switch. The lock is automatically released after a pre-established time delay. An alarm at the door may also be actuated by the switch. The electronic circuitry is configured to allow for immediate authorized egress and to implement an immediate safety release of the lock. The lock may be operated in either a normally locked or normally unlocked mode.