Patents by Inventor Walter A. Richardson

Walter A. Richardson 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).

  • Production of sodium borohydride from sodium borohydride dihydrate in a fluidized bed dryer
    Patent number: 6231825
    Abstract: Drying sodium borohydride dihydrate particles in a flowing stream of a chemically inert drying gas results in novel nearly odor-free, dust-free sodium borohydride particles which are free flowing without the need for anti-caking or flow additives. The dihydrate particles are preferably dried in a fluidized bed formed with a flowing stream of nitrogen.
    Type: Grant
    Filed: July 29, 1999
    Date of Patent: May 15, 2001
    Assignee: Rohm and Haas Company
    Inventors: Richard J. Colby, Lise L. Mahoney, Austin L. Eiseman, Walter A. Richardson
  • Tagging and identifying asphalt additives
    Patent number: 5306343
    Abstract: A tag is added to an asphalt additive, typically an anti-stripping agent. The additive dye is mixed with other components of an asphalt composition and melt processed at 300.degree. F. (149.degree. C.) or above to produce an asphalt composition. Presence of the tag to identify presence of the additive is performed by dissolving the asphalt portion of the composition in a water-immiscible solvent and then extracting the tag in an acidic aqueous solution and developing a color with a diazo compound.
    Type: Grant
    Filed: April 26, 1993
    Date of Patent: April 26, 1994
    Assignee: Morton International, Inc.
    Inventors: Walter A. Richardson, III, Alejandro Zimin, Sr., James Fuerholzer, Michael R. Friswell, Michael P. Hinton, Peter A. Caputo
  • Sodium borohydride composition and improved method of producing compacted sodium borohydride
    Patent number: 5182046
    Abstract: Improved sodium borohydride powder compositions have a silica-based anticaking agent. In a method wherein a mixture of sodium borohydride and an anti-caking agent are compacted under pressure, the process is improved, particularly in speed, by the use of a silica-based anti-caking agent.
    Type: Grant
    Filed: December 5, 1990
    Date of Patent: January 26, 1993
    Assignee: Morton International, Inc.
    Inventors: Richard A. Patton, Walter A. Richardson