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:
Jul. 11, 2000
Filed:
Feb. 01, 1999
Applicant:
Inventors:
Keiichi Mukaiyama, Nagano, JP;
Hiroshi Mukai, Nagano, JP;
Assignee:
Seiko Epson Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09D / ;
U.S. Cl.
CPC ...
106 3143 ; 106 3132 ; 106 3148 ; 106 315 ; 106 3151 ; 106 3152 ;
Abstract
An aqueous ink composition containing urea, an azo dye colorant, and water, with dissolved ammonium ion and nitrogen contents lower than 200 ppm and 5 ppm, respectively. The composition is highly stable to elevated temperatures and extended storage times, and gives excellent printing quality. Methods for making the inventive ink compositions, and methods of using the compositions in ink jet recording are also disclosed.