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:
May. 09, 1995
Filed:
Nov. 29, 1993
Toshihiko Yasui, Yokohama, JP;
Yoshio Takimoto, deceased, late of Tokyo, JP;
Katsuhiko Kawakami, Shisuimachi, JP;
Toshiyuki Kiyonari, Hasuda, JP;
Norio Endo, Tokyo, JP;
Dainippon Ink and Chemicals, Inc., Tokyo, JP;
Kirin/Beer Kabushiki Kaisha, Tokyo, JP;
Abstract
A non-destructive laser marking method including irradiating laser light on a thermosensitive color-forming layer formed by printing with a printing ink containing a leuco dye as a color former and an acidic substance as a color developer, and at least one background color formation inhibitor selected from the group consisting of a water-soluble amino acid, an ammonium salt of an inorganic acid, a pH buffer, and water. Laser marking can be achieved with low energy and at high speed while minimizing background color formation to provide a high-contrast color image.