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:
Sep. 21, 1982
Filed:
Jun. 24, 1980
Applicant:
Inventor:
Pierre Lagarde, Versailles, FR;
Assignee:
Imphy S.A., Paris, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ; G06K / ; G08B / ;
U.S. Cl.
CPC ...
235435 ; 235492 ; 324 / ; 340561 ;
Abstract
A method of marking and of identifying objects (1) which are non-conductors of electricity by inclusion of conducting masses and detection by passage through a high-frequency electromagnetic field and detection of the variation in the corresponding response signal picked up. Metallic wires (2) each selected from a range of specimens of different electric conductivity are used as marking elements. The responses are measured which are each characteristic of one specimen and of a predetermined code value. The invention applies to the recognition of the authenticity of cards or documents thus previously marked.