Patents by Inventor Donald E. Stowell

Donald E. Stowell 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).

  • High pore volume alumina powders
    Patent number: 4218413
    Abstract: A method for increasing the pore volume of alumina powder produced by spray drying alumina slurries by heating the slurry to a temperature near the boiling point of water and a pressure up to the critical point of water then introducing the slurry to a spray drying chamber through a small orifice, thereby creating a backpressure in excess of slurry vapor pressure and up to the critical point of water.
    Type: Grant
    Filed: December 18, 1978
    Date of Patent: August 19, 1980
    Assignee: Conoco, Inc.
    Inventors: Donald E. Stowell, John F. Scamehorn, Larry L. Bendig
  • Production of high strength alumina spheres by hydrogelling corresponding slurries
    Patent number: 4198318
    Abstract: Alumina spheres having high crush strength are produced by hydrogelling low viscosity acidified alumina slurries in a surfactant-containing ammonia solution, said slurries being inserted into the ammonia solution dropwise.
    Type: Grant
    Filed: November 24, 1978
    Date of Patent: April 15, 1980
    Assignee: Conoco, Inc.
    Inventors: Donald E. Stowell, R. Tom Jackson, Larry L. Bendig
  • Production of low loose bulk density alumina
    Patent number: 4177251
    Abstract: Alumina having a low loose bulk density is obtained by hydrolyzing aluminum alkoxides with water in the presence of lithium hydroxide or lithium salts yielding lithium ions. The amount of density reduction is proportional to the amount of lithium ion present.
    Type: Grant
    Filed: October 23, 1978
    Date of Patent: December 4, 1979
    Assignee: Conoco, Inc.
    Inventors: Larry L. Bendig, Donald E. Stowell, Laura A. Starks
  • High pore volume alumina from dilute high injection alkoxide feed
    Patent number: 4176171
    Abstract: An improved method for increasing alumina pore volumes said alumina being produced by the hydrolysis of aluminum alkoxides, the improvement comprising diluting the aluminum alkoxide, prior to entering the hydrolysis reactor, with an alkanol containing from 2 to 8 carbon atoms and injecting the dilute solution into the reactor at high velocities.
    Type: Grant
    Filed: August 14, 1978
    Date of Patent: November 27, 1979
    Assignee: Continental Oil Company
    Inventors: Larry L. Bendig, John F. Scamehorn, Donald E. Stowell
  • Production of high pore volume alumina spheres
    Patent number: 4140773
    Abstract: High macro-pore content spheres (>1000A) are produced by use of a rotating wheel, wherein dry alumina is dropped onto the wheel under a peptizing spray misted onto the wheel through an atomizing device. Compressive stresses normally encountered in procedures such as pelletizing are avoided, thereby preserving macro-pores. Size of spheres can be adjusted by altering, for example, the angle at which the wheel rotates.
    Type: Grant
    Filed: February 24, 1978
    Date of Patent: February 20, 1979
    Assignee: Continental Oil Company
    Inventors: Donald E. Stowell, Larry L. Bendig, John F. Scamehorn
  • Method for the formation of alumina spheres
    Patent number: 4116882
    Abstract: Alumina spheres are formed by peptizing alumina slurries, centrifugates, and filtercakes, aging and dropping the peptized material through a hydrocarbon filled column. The improved method avoids the drying and reslurrying of alumina powders currently used and provides a method whereby harmful ions such as chloride and sulfates can be excluded from the alumina.
    Type: Grant
    Filed: December 14, 1977
    Date of Patent: September 26, 1978
    Assignee: Continental Oil Company
    Inventors: Larry L. Bendig, Cathy S. Siemsen, Donald E. Stowell