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:
Feb. 20, 1990
Filed:
Sep. 23, 1987
Applicant:
Inventor:
Gary E Lavelle, Avon, CT (US);
Assignee:
Emhart Industries, Inc., Farmington, CT (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G06K / ;
U.S. Cl.
CPC ...
235382 ; 235436 ; 235437 ; 235449 ; 34082531 ;
Abstract
A reliable electronic lock comprises means for reading a key card upon insertion and withdrawal. Sets of data read from the key card are compared to CRC data read from the key card to determine which set contains actual data and no false data erroneously read by the electronic lock. The CRC data is stored in scrambled form on the card to minimize the possibility of match to a set of actual and false data.