Patents by Inventor Robert G. Christiansen

Robert G. Christiansen 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).

  • Antiandrogenic sulfonylsteroidofurans
    Patent number: 5100882
    Abstract: 5'-Alkylsulfonylsteroido[3,2-b]furans, for example 5'-methylsulfonyl-5.alpha.-pregn-2-en-20-yno[3,2-b]furan-17.beta.-ol having the structural formula, ##STR1## which are useful as antiandrogenic agents, and processes for preparation, method of use and compositions thereof are disclosed.
    Type: Grant
    Filed: June 21, 1990
    Date of Patent: March 31, 1992
    Assignee: Sterling Drug Inc.
    Inventors: Robert G. Christiansen, Malcolm R. Bell, Virendra Kumar
  • Antiandrogenic sulfonylsteroidopyrazoles and processes for preparation method of use and compositions thereof
    Patent number: 4684636
    Abstract: 1'-Sulfonylsteroido[3,2-c]pyrazoles, for example, (5.alpha.,17.alpha.)-1'-(methylsulfonyl)-1'H-pregn-20-yno[3,2-c]pyrazol-17 -ol, which are useful as antiandrogenic agents, and processes for preparation, method of use and compositions thereof are disclosed.
    Type: Grant
    Filed: April 8, 1986
    Date of Patent: August 4, 1987
    Assignee: Sterling Drug Inc.
    Inventors: Robert G. Christiansen, Malcolm R. Bell, John L. Herrmann, Jr., Chester J. Opalka, Jr.
  • 4.alpha.,5.alpha.-Epoxy-3,20-dioxopregnan e-2.alpha.,16.alpha.-dicarbonitrile and intermediates and process for preparation, method of use and compositions thereof
    Patent number: 4331663
    Abstract: 4.alpha.,5.alpha.-Epoxy-3,20-dioxopregnane-2.alpha.,16.alpha.-dicarbonitril e is prepared by decyclizing 4.alpha.,5.alpha.-epoxy-20-oxopregn-2-eno-[2,3-d]isoxazole-16.alpha.-carbo nitrile with strong base and is useful as an inhibitor of mineralocorticoid production and/or action without concomitant glucocorticoid inhibition in primates.
    Type: Grant
    Filed: June 19, 1981
    Date of Patent: May 25, 1982
    Assignee: Sterling Drug Inc.
    Inventors: Robert G. Christiansen, Malcolm R. Bell, Harry P. Schane, Jr.
  • Steroid cyanoketones and intermediates
    Patent number: 4160027
    Abstract: 2.alpha.-Cyano-3-oxosteroids having a 4.alpha.,5.alpha.-epoxy group and alkylated in the 4- and/or 6-position, useful as interceptive agents, are prepared by alkaline cleavage of the corresponding steroido[2,3-d]isoxazoles.
    Type: Grant
    Filed: December 20, 1977
    Date of Patent: July 3, 1979
    Assignee: Sterling Drug Inc.
    Inventor: Robert G. Christiansen