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. 19, 1991
Filed:
Dec. 22, 1989
Applicant:
Inventors:
John L Stoffel, San Diego, CA (US);
Ronald A Askeland, San Diego, CA (US);
William D Kappele, San Marcos, CA (US);
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09D / ;
U.S. Cl.
CPC ...
106 22 ; 106 20 ; 523160 ;
Abstract
Inks used in ink-jet printing comprise a vehicle and a dye. The vehicle consists essentially of about 5 to 10 wt % of a glycol and/or glycol ether and the balance water. The dye is typically an anionic dye, associated with undesirable cations such as sodium or potassium cations. Several properties of such inks are improved by replacing substantially all of said cations on the anionic dye with lithium cations and removing such cations, preferably to leave a maximum concentration of such cations of less than about 500 ppm, and most preferably less than about 350 ppm.