Patents by Inventor Ralph R. Pfeiffer

Ralph R. Pfeiffer 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).

  • Naphthalene-1,5-disulfonate salts of dimeric indole-dihydroindole alkaloids
    Patent number: 4558053
    Abstract: Stable, biologically available, orally active 1,5-naphthalenedisulfonate salt of vinzolidine.
    Type: Grant
    Filed: December 21, 1983
    Date of Patent: December 10, 1985
    Assignee: Eli Lilly and Company
    Inventors: Stanislaw Rolski, Ralph R. Pfeiffer
  • Method for preparing stable .beta.-lactam-type-antibiotic susceptibility test discs
    Patent number: 3937655
    Abstract: Stable antibiotic susceptibility test discs are prepared by depositing crystals of a .beta.-lactam-type-antibiotic on said discs, said crystals being dispersed in a volatile unreactive non-solvent vehicle, such dispersion being contacted with such discs and the vehicle evaporated therefrom.
    Type: Grant
    Filed: April 16, 1974
    Date of Patent: February 10, 1976
    Assignee: Eli Lilly and Company
    Inventors: Ralph R. Pfeiffer, Gary L. Engel