Patents by Inventor Jen F. Chen

Jen F. Chen 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).

  • Synchronous yarn feeding device
    Patent number: 4953348
    Abstract: A synchronous yarn feeding device comprises a yarn feeding drum and a driving belt. The drum is provided with protrusions or studs that are arranged for cooperative engagement with concave surfaces or holes in the driving belt. A portion of the driving belt presses yarn onto the drum such that rotation of the drum and feeding of the yarn are synchronous with the speed of the driving belt.
    Type: Grant
    Filed: October 23, 1989
    Date of Patent: September 4, 1990
    Inventor: Jen F. Chen
  • Yarn feeder
    Patent number: D315914
    Type: Grant
    Filed: May 13, 1988
    Date of Patent: April 2, 1991
    Inventor: Jen F. Chen