Patents by Inventor Richard Leiberich

Richard Leiberich 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).

  • Gastric juice resistant gelatin capsules and a process for the production thereof
    Patent number: 3959540
    Abstract: Gastric juice resistant gelatin capsules characterized by a gastric juice resistant outer coating of an anionic polymerizate of methacrylic acid and acrylic acid esters and an intermediate layer between the outer layer and the gelatin shell of a cationic polymerizate of di-lower alkylamino lower alkylmethyl acrylate with other neutral methacrylic esters and a process for preparing the same.
    Type: Grant
    Filed: August 8, 1974
    Date of Patent: May 25, 1976
    Assignee: R.P. Scherer GmbH
    Inventors: Richard Leiberich, Wilfried Gabler