Patents by Inventor Laurens Wilhelm van den Akker

Laurens Wilhelm van den Akker 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 the preparation of chloro-benzoylchlorides
    Patent number: 6069274
    Abstract: An effective and efficient process for the preparation of chloro-benzoylchlorides of formula I, ##STR1## (n is defined in the specification). In this process a a chloro-trichloromethylbenzene of formula II ##STR2## is treated with water acid in the presence of a Lewis at temperatures below 80.degree. C. The compounds obtained according to this process can be used to prepare certain chloro-substituted benzophenones.
    Type: Grant
    Filed: January 12, 1998
    Date of Patent: May 30, 2000
    Assignee: American Cyanamid Company
    Inventors: Laurens Wilhelm van den Akker, Monika Brink
  • Process for the preparation of chloro-benzoyl chlorides
    Patent number: 5981803
    Abstract: An effective and efficient process for the preparation of chloro-benzoylchlorides of formula I, ##STR1## (n is defined in the specification). In this process a a chloro-trichloromethylbenzene of formula II ##STR2## is treated with water acid in the presence of a Lewis at temperatures below 80.degree. C. The compounds obtained according to this process can be used to prepare certain chloro-substituted benzophenones.
    Type: Grant
    Filed: January 15, 1999
    Date of Patent: November 9, 1999
    Assignee: American Cyanamid Company
    Inventors: Laurens Wilhelm van den Akker, Monika Brink