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:
Jul. 25, 1978
Filed:
Apr. 27, 1976
Applicant:
Inventor:
Steven Kolber, Wayne, NJ (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08B / ; H04Q / ;
U.S. Cl.
CPC ...
3401 / ; 3401 / ; 3403 / ; 340571 ;
Abstract
A security device for an electronic calculator consists of an electronic circuit within the calculator which permits operation of the calculator only after the operator has correctly operated a predetermined sequence of keys. The circuit is connected to the sense and the digit drive lines of an electronic calculator having an electronically scanned keyboard. The circuit includes a key selection matrix, a valid actuation discriminator logic, an actuation sequence counter, an alarm inhibiter and an alarm which disables the proper functioning of the calculator.