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:
Jun. 29, 1999
Filed:
Aug. 25, 1997
Applicant:
Inventors:
Amy Lisa Bearson, Ocean Springs, MS (US);
John Robert Eubanks, Ocean Springs, MS (US);
Alan Daniel Farmer, Biloxi, MS (US);
Franklin Dewitt Ford, Grand Bay, AL (US);
Diana Boney Haydel, Ocean Springs, MS (US);
August John Muller, Mobile, AL (US);
Assignee:
First Chemical Corporation, Pascagoula, MS (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F / ; C08F / ; G03C / ;
U.S. Cl.
CPC ...
526204 ; 522 53 ; 522348 ; 4302811 ;
Abstract
A process for preparing thioxanthone and derivatives thereof is disclosed. In the process, an aromatic compound, such as cumene, is reacted with thiosalicylic acid (TSA) or dithiosalicylic acid (DTSA) in the presence of sulfuric acid. The reaction mixture, which includes thioxanthone or a derivative thereof, is thereafter distilled under reduced pressure to recover the thioxanthone compound.