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. 10, 1990
Filed:
May. 19, 1989
Kiyotaka Iiyama, Mishima, JP;
Kunio Hayakawa, Gotenba, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
Coloring phthalide compounds having general formula [I] ##STR1## R.sup.1 represents hydrogen, an alkyl group, or halogen, m is an integer of 1 to 4, when m is 1, R.sup.2 represents hydrogen, an amino group, an alkylamino group, a dialkylamino group, a cyclic amino group, an alkyl group, or halogen, when m is 2 to 4, R.sup.2 represents halogen, R.sup.3 and R.sup.4 each represent a straight chain or branched alkyl group having 1 to 8 carbon atoms, a cyclic alkyl group, or a benzyl group, and R.sup.5 represents hydrogen, an alkyl group or an alkoxyl group; and a thermosensitive recording material including a thermosensitive recording layer comprising any of the above coloring phthalides and a color developer capable of inducing color formation in the phthalide compound are disclosed.