Patents by Inventor Richard A. Runkel

Richard A. Runkel 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: 5152995
    Abstract: Acid-sensitive antibiotic esters for oral administration to livestock are stabilized by incorporation in premix formulations comprising a carrier, a base, a protective coating, and optionally a sealant film.
    Type: Grant
    Filed: October 12, 1989
    Date of Patent: October 6, 1992
    Assignee: Syntex (U.S.A.) Inc.
    Inventors: Richard A. Runkel, Stephen A. Berry, Mahmood M. Ghani
  • Patent number: 5035891
    Abstract: A sustained release, reservoir-type subcutaneous implant device for the sustained administration to a subject of a biologically active compound comprises:an effective amount of a biologically active compound;an amount of a solid hydrophilic polymer sufficient to cause swelling of the device by osmotic pressure after implantation;an effective amount of a solubilizing agent; anda sufficient amount of a non-porous rate-controlling membrane which completely encapsulates said biologically active compound, wherein said rate-controlling membrane is permeable to said biologically active compound, but is impermeable to said solubilizing agent. This device is particularly advantageous for the administration of growth promoting compounds to livestock.
    Type: Grant
    Filed: August 24, 1989
    Date of Patent: July 30, 1991
    Assignee: Syntex (U.S.A.) Inc.
    Inventors: Richard A. Runkel, Jung-Chung Lee