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. 01, 1981
Filed:
Oct. 24, 1979
Applicant:
Inventors:
Al Tureck, Skokie, IL (US);
Theodore P Gordon, Chicago, IL (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ; B42D / ;
U.S. Cl.
CPC ...
3502 / ; 283 / ; 283 / ; 356256 ; 428916 ;
Abstract
A security system to prevent the unauthorized duplication of documents on standard electrostatic copiers. Paper substrates are coated with layers of carefully sized and spaced beads which break up the light emitted by a copier to a degree sufficient to preclude copying. In another embodiment, an original consisting of a paper substrate bonded to a reflective metalized film reflects light from the copier, and masks the image of any intelligence present on the substrate.