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:
Apr. 12, 1988
Filed:
Oct. 22, 1985
Masaru Shimada, Shizuoka, JP;
Toshiyuki Kawanishi, Numazu, JP;
Kakuji Murakami, Shizuoka, JP;
Tamotsu Aruga, Numazu, JP;
Hiroyuki Uemura, Numazu, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An aqueous ink composition for ink-jet recording comprising an aqueous solution of a water-soluble dye of formula (I) and a humectant dissolved in water: ##STR1## wherein R.sup.1 and R.sup.2 each represent hydrogen, an alkyl group, an alkoxy group, halogen, a carboxyl group or a sulfonic acid group; R.sup.3 and R.sup.4 each represent a hydroxyl group, halogen, an alkoxy group, an unsubstituted or substituted amino group; X represents --O--, --CH.sub.2 --, --C.sub.2 H.sub.4 --, --CH.dbd.CH--, --S--, --SO.sub.2 -- or --; Ar.sup.1 and Ar.sup.2 each represent an unsubstituted or substituted phenyl group, an unsubstituted or substituted naphthyl group; M represents hydrogen ion, an alkali metal cation, amine cation or an ammonium ion; and n is an integer of 1, 2 or 3.