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. 30, 1997
Filed:
Jan. 25, 1996
Pierre de Saint-Romain, Valence, FR;
Alain Heraud, Valence, FR;
Image S.A., Bourg-Les-Valence, FR;
Abstract
This aim of the invention is to develop an ink composition comprising at least one non-photochromic pigment or dye, a photochromic pigment or dye and a solvent, the photochromic pigment or dye changing absorption spectrum under the effect of a first light emitting in a wavelength belonging to the ultra-violet range, so that when it is subsequently illuminated by a second light only emitting in a wavelength belonging to the visible range, it has a color different from that which it had, under the illumination of said second light, prior to illumination by said first light, said color also differing from that of the non-photochromic pigment or dye when the latter is illuminated by said second light.