Title: Security material and secure document system using said material

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.

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Inventors: Lee, Cyril A. (Littlewick Green, GB)

Application Number: 859234
Filing Date: 1977-12-09
Publication_date: 1979-12-25
Assignee: E M I Limited (Hayes, GB2)
Primary Class(es): 235/493 156/233, 235/440, 235/450, 283/77, 283/82, 283/83, 283/112, 346/74.3
Other Classes:
US Patent Ref:

2784392	Mar, 1957	Chaimowicz	235/493.
2791310	May, 1957	Jones	235/493.
3161457	Dec, 1964	Schroeder et al.	346/76.
3465307	Sep, 1969	Schmidt	235/493.
3505501	Apr, 1970	Ruddock et al.	235/493.
3560715	Feb, 1971	Akamatsu et al.	235/499.
3998160	Dec, 1976	Pearce	235/493.
4023204	May, 1977	Lee	235/493.
4044231	Aug, 1977	Beck et al.	235/493.

Other Refs: 12639911331604

Feb, 1972	GB.
Sep, 1973	GB.

Primary Examiner: Cook, Daryl W.
Assistant Examiner:
Attorney: Fleit & Jacobson