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:
Jun. 06, 1995
Filed:
May. 28, 1993
Applicant:
Inventors:
Arshavir Gundjian, Montreal, CA;
Abraham Kuruvilla, Quebec, CA;
Assignee:
Nocopi Technologies, Inc., Wayne, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09D / ; B41M / ;
U.S. Cl.
CPC ...
106 / ; 106 / ; 106 / ; 427-7 ; 427145 ; 427157 ;
Abstract
A security marking method comprises marking a portion of the substrate by applying a first marking fluid which is invisible to a unaided eye when illuminated by both visible light and ultraviolet light and activating the marked portion by applying a second marking fluid thereon. The second marking fluid is reactable with the first marking fluid to be invisible to an unaided human eye when illuminated by visible light and fluorescent when illuminated by ultraviolet light. The invention also includes the composition comprising the first and second marking fluids.