Patents by Inventor Mohinder K. Gupta

Mohinder K. Gupta 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).

  • Steam-drawing process for yarns
    Patent number: 5259098
    Abstract: A process for drawing thermoplastic multifilament yarns, wherein the yarns have different natural draw ratios, at least one of which is greater than the machine draw ratio used in the process. The yarns are first impinged with a hot fluid to heat them to an elevated temperature and then stretched over a set of draw rolls at a single machine draw ratio. In a preferred aspect of the invention, the yarns are crimped after stretching. Preferably, the thermoplastic yarns are either polypropylene or polyamide yarns.
    Type: Grant
    Filed: March 12, 1992
    Date of Patent: November 9, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Mohinder K. Gupta
  • Treatment for bulked continuous filament yarns
    Patent number: 4319388
    Abstract: A process for making yarns bulked in a hot fluid jet more uniform in bulk comprises cooling the hot and bulked yarn on a moving screen with a water mist followed by passing the wet yarn under a tension of 0.01-0.05 gpd through a turbulent forwarding jet of steam and then through a cooling stream of air which impinges perpendicularly on the yarn while the yarn is moving under slightly greater tension of about 0.02-0.15 gpd and then wound up under normal packaging tension.
    Type: Grant
    Filed: June 11, 1980
    Date of Patent: March 16, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Ashok J. Champaneria, Mohinder K. Gupta