Patents by Inventor John B. Stallman

John B. Stallman 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).

  • Thioglycerol derivatives and their use in polysulfide compositions for optical material
    Patent number: 6066758
    Abstract: Novel thioglycerol derivatives, processes for their manufacture, and optical materials made from such compounds. The thioglycerol derivatives have high concentrations of sulfur relative to compounds conventionally used for optical materials, and thus exhibit high refractive indices without sacrificing processability.
    Type: Grant
    Filed: September 2, 1999
    Date of Patent: May 23, 2000
    Assignee: Hampshire Chemical Corp.
    Inventors: Richard P. Woodbury, John B. Stallman, George F. Winterson, Kenneth L. Avery
  • Thioglycerol derivatives and their use in polysulfide compositions for optical material
    Patent number: 5973192
    Abstract: Novel thioglycerol derivatives, processes for their manufacture, and optical materials made from such compounds. The thioglycerol derivatives have high concentrations of sulfur relative to compounds conventionally used for optical materials, and thus exhibit high refractive indices without sacrificing processability.
    Type: Grant
    Filed: November 26, 1997
    Date of Patent: October 26, 1999
    Assignee: Hampshire Chemical Corp.
    Inventors: Richard P. Woodbury, John B. Stallman, George F. Winterson, Kenneth L. Avery
  • Preparation of acylated .alpha.-amino carboxylic acid amides
    Patent number: 5763661
    Abstract: A method of preparing acylated .alpha.-amino carboxylic acid amides directly from amino nitriles in high yield and purity. The method involves acylating the amino nitrile with an acyl halide under Schotten-Baumann conditions, and hydrolyzing the resulting nitrile to the amide. The resulting acylated amino carboxylic acid amide precipitates and can be isolated by filtration in high purity.
    Type: Grant
    Filed: January 17, 1997
    Date of Patent: June 9, 1998
    Assignee: Hampshire Chemical Corp.
    Inventor: John B. Stallman