Patents by Inventor Paul Buchschacher

Paul Buchschacher 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).

  • Methylation of de-A steroids
    Patent number: 4087436
    Abstract: Treatment of de-A steroids with a methylation agent at extremely low temperatures, i.e., below -50.degree. C. produces corresponding 10.beta.-methyl-.DELTA..sup.9(11) -deA steroids with a high 10.beta. to 10.alpha. isomer ratio. A number of the product 10.beta.-methyl-.DELTA..sup.9(11) -deA steroids are novel compounds. They are useful as intermediates in the synthesis of known medicinally valuable steroids.
    Type: Grant
    Filed: June 23, 1975
    Date of Patent: May 2, 1978
    Assignee: Hoffmann-La Roche, Inc.
    Inventors: Paul Buchschacher, Andor Furst, Ludwig Labler, Werner Meier, John William Scott