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:
Oct. 11, 1994
Filed:
Apr. 19, 1993
Applicant:
Inventor:
Arshavir Gundjian, Montreal, CA;
Assignee:
Nocopi Technologies, Inc., Wayne, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B41M / ; B42D / ;
U.S. Cl.
CPC ...
503201 ; 503206 ; 503207 ; 283 67 ; 283 95 ; 283902 ; 428207 ; 428333 ; 428531 ; 428915 ; 428916 ;
Abstract
A method for protecting against duplication of a document with a color copier comprises providing a background color on a document having an average reflectance value and printing on the background with a contrast color having a spectral characteristic which modulates the average reflectance value by no more than 5% and has an average value equal to the average reflectance value. The contrast color is printed with a printing medium that allows activation by a rub and reveal action or by application of intense light.