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:
Feb. 19, 1991
Filed:
Apr. 17, 1989
Yoshikazu Mimura, Tokyo, JP;
Keiichi Takano, deceased, late of Kanagawa, JP;
Tomohisa Gotou, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A new crystal form of a titanyl phthalocyanine compound is provided. This crystal form shows characteristic strong absorption peaks at 1,332.+-.2 cm.sup.-1, 1,074.+-.2 cm.sup.-1, 962.+-.2 cm.sup.-1 and 783.+-.2 cm.sup.-1 in an infrared absorption spectrum and/or characteristic strong peaks at 27.2.degree., 9.7.degree. and 24.1.degree. of Bragg's angle 2.theta. in an X-ray diffraction spectrum and has very good dispersibility and stability in a solvent and also very good photoelectric conversion efficiency and so is very useful particularly as a charge generation agent highly sensitive in a semiconductor laser wavelength region as required in a photosensitive material for a highspeed high-definition printer. Such crystal form can be obtained by treating non-crystalline titanyl phthalocyanine with tetrahydrofuran.