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. 03, 1991
Filed:
Nov. 05, 1990
Applicant:
Inventor:
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 ;
Abstract
The properties of inks employing copper phthalocyanine dyes having associated therewith sodium cations are improved by replacing the sodium cations with potassium cations. This ion exchange is preferably performed by passing a potassium-containing base through a strong acid resin to replace the H.sup.+ ions with K.sup.+ ions. The dye is then passed through the potassium-loaded resin to effect the ion exchange. Inks made from the potassium-substituted dyes evidence reduced crusting, increased idle time without causing drop ejection failures (soft plugs) and improved kogation without suffering any loss in print quality.