Patents by Inventor Oscar R. Buehler

Oscar R. Buehler 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).

  • Process for purifying hexamethylenediamine
    Patent number: 4282381
    Abstract: Hexamethylenediamine (HMD) is purified by dissolving ammonia in crude molten HMD under pressure, directing the solution thus prepared to a reduced pressure zone where the ammonia is vaporized thereby causing a portion of the HMD to crystallize following which the crystals in the slurry are washed with essentially pure HMD. This purified HMD is suitable for conversion into polyamide fibers.
    Type: Grant
    Filed: August 21, 1980
    Date of Patent: August 4, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Oscar R. Buehler, Harold F. Porter