Patents by Inventor Ralph E. Gravrok

Ralph E. Gravrok 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).

  • Agricultural spray oils containing zinc dialkyldithiophosphates
    Patent number: 4165230
    Abstract: The phytotoxicity of conventional agricultural spray oils is reduced by the incorporation therein of between 0.10 and 0.25 weight/volume percent thereof of at least one zinc dialkyldithiophosphate wherein the alkyl group ranges from C.sub.3 to C.sub.8. The additive also provides zinc and phosphorus to the plants treated with such oils.
    Type: Grant
    Filed: July 21, 1978
    Date of Patent: August 21, 1979
    Assignee: Texaco Inc.
    Inventors: Ralph E. Gravrok, Clarence A. L. Phillips