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. 18, 1987
Filed:
Apr. 15, 1985
H Frank Fogleman, San Diego, CA (US);
Randall E Parrish, San Diego, CA (US);
The Protech Partnership, San Diego, CA (US);
Abstract
The electronically controlled locking apparatus is used with a door such as a safe door, and enables the door to be released by either a mechanical combination lock or an electrical lock control circuit. The control circuit generates an output signal when a correct access code is entered by a user for causing a control linkage to release the door. Alternatively, the mechanical lock can also cause the control linkage to release the door by authorized personnel, in the event of either a control circuit malfunction, or the authorized user being unable to recall the access code. The circuit includes both a non-volatile and a volatile memory means for storing the access code, and a display device for providing a visual indication of the correct code within the protected area, so that the door can be unlocked with the mechanical lock, and then the access code for the electrical lock circuit can be viewed at the protected side of the door.