Patents by Inventor Leif R. Simonsen

Leif R. Simonsen 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).

  • Fiber blends for improved carpet texture retention
    Patent number: 5284009
    Abstract: The present invention relates to ply-twisted yarns comprising fiber blends of about 70 to 90 weight percent base fiber and about 10 to 30 percent non-melt compatible polyolefin fiber having a melting point of about 130.degree. to 170.degree. C. The base fiber may be polyamides, polyesters, or fiber mixtures thereof. The ply-twisted yarns may be heat-set by a conventional process, whereupon the polyolefin fibers melt and bond to each other but do not bond to the base fibers.
    Type: Grant
    Filed: March 9, 1993
    Date of Patent: February 8, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Wae-Hai Tung, Leif R. Simonsen, Yashavant V. Vinod, Frank Werny
  • Battery containing a metal anode and an electrolyte providing high rates of metal electrolysis at near ambient temperatures
    Patent number: 4882244
    Abstract: A high rate, high energy density electrochemical cell utilizing a metal anode is disclosed. This electrochemical cell contains an acidic electrolyte which comprises a cation component, a Lewis acid, and a nitrile compound.
    Type: Grant
    Filed: April 2, 1987
    Date of Patent: November 21, 1989
    Assignee: The University of Michigan-Ann Arbor
    Inventors: Francis M. Donahue, Leif R. Simonsen, Russell L. Moy