Patents by Inventor Ezzio Rizzardo

Ezzio Rizzardo 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).

  • Patent number: 4670190
    Abstract: The invention provides novel 1.alpha.-hydroxy vitamin D compounds and a method for their preparation from 1.alpha.-hydroxy-25-hydrogen cholesta-5,7-dienes by irradiation and isomerization techniques. The invention also includes the said 1.alpha.-hydroxy-25-hydrogen-cholesta-5,7-dienes and the corresponding cholest-5-enes.The new compounds may be obtained in a crystalline form substantially free from isomeric or other impurities arising from manufacture.
    Type: Grant
    Filed: October 3, 1984
    Date of Patent: June 2, 1987
    Inventors: Robert H. Hesse, Ezzio Rizzardo, Derek H. R. Barton