Patents by Inventor Robert A. Frankshun

Robert A. Frankshun 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 N,N-dimethyl 2-(methylthio) benzamides and analogs
    Patent number: 4814501
    Abstract: Pyrolysis of substituted salicylate O(N,N-dialkyl)thiocarbamates yielded the corresponding N,N-dialkyl-2-(methylthio)benzamide. Similarly, substituted 6-azasalicylate O(N,N-dialkyl)thiocarbamates yielded the corresponding N,N-dialkyl-2-(methylthio)-6-aza-benzamide.
    Type: Grant
    Filed: December 28, 1987
    Date of Patent: March 21, 1989
    Assignee: Merck & Co., Inc.
    Inventors: Bruce E. Witzel, Robert K. Baker, Philippe L. Durette, Robert A. Frankshun
  • Preparation of 3.beta.-hydroxy-27-norcholest-5-ene-25-one and intermediates thereof
    Patent number: 4145346
    Abstract: A process for preparing 3.beta.-hydroxy-27-norcholest-5-ene-25-one, a useful intermediate in the synthesis of 25-acetoxy vitamin D.sub.3, novel intermediates, and preparation thereof are disclosed.
    Type: Grant
    Filed: October 3, 1977
    Date of Patent: March 20, 1979
    Assignee: Merck & Co., Inc.
    Inventors: Howard Jones, Robert A. Frankshun
  • Process for preparing 1-.alpha.-hydroxy cholesterol derivatives
    Patent number: 4046760
    Abstract: Improved processes are described for introducing a 1-.alpha.-hydroxy group into the cholesterol ring system. Novel intermediates and their preparation are disclosed.
    Type: Grant
    Filed: July 1, 1976
    Date of Patent: September 6, 1977
    Assignee: Merck & Co., Inc.
    Inventors: Howard Jones, Robert A. Frankshun