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:
Dec. 25, 1979
Filed:
Dec. 09, 1977
Applicant:
Inventor:
Cyril A Lee, Littlewick Green, GB;
Assignee:
E M I Limited, Hayes, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06K / ; G09F / ; G06K / ; G11B / ;
U.S. Cl.
CPC ...
235493 ; 40-22 ; 235440 ; 235450 ; 3401 / ; 346 741 ;
Abstract
A secure document is produced by securely attaching to a support a body of including a security feature and having a shape which conveys information to the eye. For example the body is a layer of magnetizable material having apertures of letters, numbers and the like. The document can be examined by both magnetic and optical examination apparatus to cross-check that no alteration has been made. A method of making a secure document and examination apparatus is also described. The security feature may be a pattern of magnetic anisotropy fixed into the material.