Patents by Inventor Leroy Chi-Tsun Lin

Leroy Chi-Tsun Lin 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).

  • Continuous low moisture catalytic method for polymerization of caprolactam
    Patent number: 4471081
    Abstract: This invention is an improvement to the continuous method to polymerize caprolactam at temperatures over 220.degree. but below 280.degree. C. in the presence of free water, a catalyst capable of generating phosphoric acid at the reaction conditions, in the hydrolyzer to form a prepolymer, with subsequent stripping of water and other low boiling compounds, and with completion of polymerization in a final finisher under a vacuum. The improvement comprises limiting the amount of free water fed to the polymerization process to less than about 1.5 percent but above 0.
    Type: Grant
    Filed: May 27, 1983
    Date of Patent: September 11, 1984
    Assignee: Allied Corporation
    Inventors: John A. Bander, Timothy S. Brown, Leroy Chi-Tsun Lin, Donna M. Vultaggio