Patents by Inventor Nirmal Kumas Agarwal

Nirmal Kumas Agarwal 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).

  • Process of making staple fibers
    Patent number: 7578957
    Abstract: Improved staple fibers and processes for producing them are provided. The processes are particularly useful for forming staple fibers from poly(trimethylene terephthalate), especially carpet staple fibers. The processes include prewetting undrawn yarns and drawing the fibers under wet and warm conditions, thermo-fixing the texture, and drying at relatively low temperatures. Fibers produced according to the processes disclosed herein have improved properties and reduced brittleness as compared to fibers prepared using conventional processes.
    Type: Grant
    Filed: December 10, 2003
    Date of Patent: August 25, 2009
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Jing Chung Chang, Richard Lee Dommel, Ramunas L. Valteris, Robert Mamoru Linek, Alfred Harold Thompson, Nirmal Kumas Agarwal