Patents by Inventor John Lawrence Warthen

John Lawrence Warthen 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).

  • Control of physical properties of alumina extrudates
    Patent number: 4045372
    Abstract: A process for preparing extrudates of alumina monohydrate having densities, surface areas and pore volumes within a predetermined range by mixing the alumina with a sufficient quantity of water to prepare an extrudable product and aging this product for a period of 1/2 to 6 hours. The alumina is then extruded and the extrudates dried using conventional techniques. The alumina is primarily used as a base for auto exhaust conversion catalysts.
    Type: Grant
    Filed: July 1, 1976
    Date of Patent: August 30, 1977
    Assignee: W. R. Grace & Co.
    Inventors: John Lawrence Warthen, Warren Stanley Briggs, Marvin Vernon Paggen