Patents by Inventor Amy P. Essenfeld

Amy P. Essenfeld 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 esters of 3,5,6-trichlorosalicyclic acid
    Patent number: 5194666
    Abstract: An improved process for the synthesis of esters of 3,5,6-trichlorosalicylic acid in quantitative yield comprises reacting the acid with an alcohol under distillation conditions in the presence of a titanium ester or chelate catalyst, whereby byproduct ether formation from the alcohol is suppressed. The process is especially applicable to a process by which salicylic acid is chlorinated first in concentrated sulfuric acid and then with iodine catalyst to make the trichlorosalicylic acid which is extracted and then reacted with an alcohol and a titanium catalyst to make the ester.
    Type: Grant
    Filed: July 30, 1992
    Date of Patent: March 16, 1993
    Assignee: American Cyanamid Company
    Inventors: John A. Sedlak, Mark A. Higgins, Amy P. Essenfeld
  • Process for the preparation of naphthacenes
    Patent number: 4855520
    Abstract: A process for the preparation of a substituted naphthacene is disclosed wherein a 1,3-diphenylpropargyl alcohol is reacted with an alkanesulfonyl halide, the resultant reaction product is heated in the presence of a hindered amine base and the resultant substituted naphthacene is recovered.
    Type: Grant
    Filed: August 3, 1987
    Date of Patent: August 8, 1989
    Assignee: American Cyanamid Company
    Inventor: Amy P. Essenfeld