Patents by Inventor Franklin Dewitt Ford

Franklin Dewitt Ford has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for preparing thioxanthone and derivatives thereof
    Patent number: 5916984
    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.
    Type: Grant
    Filed: August 25, 1997
    Date of Patent: June 29, 1999
    Assignee: First Chemical Corporation
    Inventors: Amy Lisa Bearson, John Robert Ira Eubanks, Alan Daniel Farmer, Franklin Dewitt Ford, Diana Boney Haydel, August John Muller
  • Processes for preparing thioxanthone and derivatives thereof
    Patent number: 5907046
    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.
    Type: Grant
    Filed: August 25, 1997
    Date of Patent: May 25, 1999
    Assignee: First Chemical Corporation
    Inventors: Amy Lisa Bearson, John Robert Ira Eubanks, Alan Daniel Farmer, Franklin Dewitt Ford, Diana Boney Haydel, August John Muller
  • Processes for preparing thioxanthone and derivatives thereof
    Patent number: 5712401
    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.
    Type: Grant
    Filed: April 29, 1996
    Date of Patent: January 27, 1998
    Assignee: First Chemical Corporation
    Inventors: Amy Lisa Bearson, John Robert Ira Eubanks, Alan Daniel Farmer, Franklin Dewitt Ford, Diana Boney Haydel, August John Muller