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. 02, 1983
Filed:
Jun. 30, 1981
Applicant:
Inventor:
Walter J Aston, Dudley, GB;
Assignee:
Scovill Inc., Waterbury, CT (US);
Primary Examiner:
Int. Cl.
CPC ...
H04Q / ;
U.S. Cl.
CPC ...
34082531 ; 235382 ;
Abstract
An electronic security device includes a memory and a card reader which reads a combination code and calculation data from a key card. An electronic circuit compares the content of the memory with the combination code and enables the lock device if a match is found. If the key card is a new one the circuit calculates a new combination code by applying the calculation data to the memory content and, if this new combination code matches that on the key card the memory is loaded with the new combination code.