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:
Jun. 06, 1989
Filed:
Nov. 09, 1988
Gerard Silvestre de Ferron, Greasque, FR;
Eurotechnique, Rousset, FR;
Abstract
An electrically programmable ROM is provided for avoiding frauds by producing, internally in the memory, the different potentials which it uses for verifying the memory points chosen. The verification of writing of information in a point is obtained by subjecting this point to a calibrated selection voltage, to which an external operator cannot have access. This calibrated voltage is produced by a multiplying generator. This latter feeds into one or more calibrators for producing all the useful voltages. Reading and writing orders are then given to a switching circuit which causes the corresponding application of these calibrated voltages. An external operator cannot enter in the memory level falsified signals for modifying the meaning of the contents of the recorded information.