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:
Mar. 16, 1999
Filed:
Jul. 24, 1997
Kiyofumi Nagai, Tokyo, JP;
Akio Kojima, Tokyo, JP;
Masato Igarashi, Kanagawa, JP;
Akiko Konishi, Kanagawa, JP;
Hiroyuki Mochizuki, Tokyo, JP;
Takanori Tsuyuki, Kanagawa, JP;
Masayuki Koyano, Kanagawa, JP;
Ikuko Tanaka, Tokyo, JP;
Ricoh Company, Ltd, Tokyo, JP;
Abstract
A recording ink composition contains a colorant which is soluble or dispersible in water and includes at least one phthalocyanine compound of formula (1) which may have a halogen atom as a substituent and at least one of phthalocyanine compounds of formulas (2) and (3); a dispersant which includes at least one polymeric compound having a hydrophilic moiety and a hydrophobic moiety, and/or at least one surfactant having an alkyl group having 5 or more carbon atoms; water; and a humectant. In addition, images with a resolution of 10 dots/mm.times.10 dots/mm or more can be recorded on an image receiving medium by ejecting the above-mentioned recording ink composition in the form of droplets by the application of thermal or mechanical energy thereto onto an image receiving medium with a Stockigt size degree of 3 seconds or more, with the recording ink composition being deposited in an amount of 20 pl/mm.sup.2 to 200 pl/mm.sup.2 on the image receiving medium.