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:
May. 23, 1989
Filed:
Oct. 08, 1986
Teijiro Kitao, Tondabayashi, JP;
Tetsuhiko Yamaguchi, Hadano, JP;
Katsumi Murofushi, Yokohama, JP;
Masato Futagami, Kawasaki, JP;
Nobuyuki Nagato, Wako, JP;
Kunio Imamura, Tokorozawa, JP;
Showa Denko Kabushiki Kaisha, Tokyo, JP;
Abstract
A fluoran derivative useful for a heat-sensitive recording material, having the following general formula I; ##STR1## wherein R.sub.1 and R.sub.2, which may be the same or different, stand for an alkyl group having 1 to 9 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a phenyl group or a phenyl group substituted by an alkyl group having 1 to 4 carbon atoms, and R.sub.3 and R.sub.4, which may be the same or different, stand for an alkyl group having 1 to 6 carbon atoms or a phenyl group or R.sub.3 and R.sub.4 may form a 5- to 8-membered cycloalkane together with the carbon atom to which they are bonded.