Patents by Inventor James A. Stevenson

James A. Stevenson 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).

  • Patent number: 5115029
    Abstract: In one embodiment, the present invention is a polymeric composition, in pellet form, which comprises a vinyldene chloride interpolymer, and a friction reducing polymer (FRP) in an amount of from about 0.1 to about 40 weight percent, said weight percent being based on the total weight of the polymeric composition. The FRP is selected to selected to lower the frictional coefficient and the mechanical energy to extrude of the polymeric composition. In another embodiment, the present invention is a polymeric composition, in either power or pellet form, possessing improved extrudability, composition comprises a vinylidene chloride interpolymer in an amount of from about 55 to about 99.85 weight percent, a FRP in an amount from about 0.1 to about 40 weight percent, and a salt of an acid in an amount of between about 0.05 and about 5 weight percent, said weight percents being based on the total weight of the polymeric composition.
    Type: Grant
    Filed: February 26, 1990
    Date of Patent: May 19, 1992
    Assignee: The Dow Chemical Company
    Inventors: Donald E. Kirkpatrick, James A. Stevenson, Kun S. Hyun
  • Patent number: 4815484
    Abstract: A styling comb for use in hair treatments advantageously provides a variety of divisions for hair sections to enable careful and accurate treatment of hair. The styling comb includes a back portion, a handle portion connected to the back portion, and first and second sets of teeth arranged in an outwardly projecting manner from the back portion. The first set of teeth is separated into two interleaved levels, while the second set of teeth is arranged in three interleaved levels.
    Type: Grant
    Filed: March 31, 1988
    Date of Patent: March 28, 1989
    Inventor: James A. Stevenson