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. 22, 2005
Filed:
Sep. 17, 2002
Applicants:
Tetsuo Hachiya, Tokyo, JP;
Naoyuki Kitamura, Tokyo, JP;
Hiroaki Mori, Tokyo, JP;
Toshiyuki Yasuda, Tokyo, JP;
Inventors:
Tetsuo Hachiya, Tokyo, JP;
Naoyuki Kitamura, Tokyo, JP;
Hiroaki Mori, Tokyo, JP;
Toshiyuki Yasuda, Tokyo, JP;
Assignee:
JFE Chemical Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C07C022/00 ;
U.S. Cl.
CPC ...
Abstract
A method for preparing bromofluorenes includes a step of dispersing a compound selected from the group consisting of fluorene, fluorenone, and derivatives of fluorene and fluorenone in water to prepare a disperse system. Bromination is initiated by adding bromine Brinto the disperse system. Thus, bromofluorenes can be efficiently and economically prepared without using any environmentally harmful organic solvent requiring a high cost to dispose of.