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:
Feb. 24, 1998
Filed:
Nov. 06, 1996
Wendy Nadan, Moorefield, Ontario, CA;
John E Kibbee, Guelph, Ontario, CA;
Thomas R Oswald, Grand Island, NY (US);
Other;
Abstract
A leach resistant ink composition including a diphenyl guanidine compound, an acid, and a resin. The ink composition may further include a glycol and an alcohol and can be printed on paper, such as, for example, in the word 'VOID'. If bleach is used to attempt to alter the document, the initially colorless ink will form a colored image in the shapes or letters printed on the paper. The ink composition is resistant to leaching upon contact with, for example, water. The presence of the acid enables the security composition to be invisible by preventing or minimizing undesirable reactions with chemically sensitive paper.