Patents by Inventor Brenda L. Renalls

Brenda L. Renalls 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).

  • Method for making biaxially-oriented polyester film having a dual-sided appearance and article made therefrom
    Patent number: 5043197
    Abstract: A biaxially-oriented polymer film having dual-sided appearance, i.e., the color of each side is chromatically different. Also a method for making such films.
    Type: Grant
    Filed: November 13, 1990
    Date of Patent: August 27, 1991
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Brenda L. Renalls
  • Biaxially-oriented polyester film having a dual-sided appearance and method for making same
    Patent number: 4990401
    Abstract: A biaxially-oriented polymer film having dual-sided appearance, i.e., the color of each side is chromatically different. Also a method for making such films.
    Type: Grant
    Filed: January 6, 1989
    Date of Patent: February 5, 1991
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Brenda L. Renalls
  • Opaque polyester film containing fine carbon black particles
    Patent number: 4603073
    Abstract: A magnetic recording medium has a biaxially-oriented polyester film base which includes carbon black beads having a median diameter from 50 to 500 nm and is substantially free from beads or agglomerates more than 5 micrometers in diameter. The beads provide opacity such as is often required of the flexible recording disk of a diskette. The film base may be either a single layer, throughout which the beads are uniformly dispersed, or it may be multi-layer, e.g., a central layer containing the carbon black beads and two surface layers which are free from the beads.
    Type: Grant
    Filed: June 24, 1985
    Date of Patent: July 29, 1986
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Brenda L. Renalls, Douglas G. Pedrotty, John F. Donlon
  • Magnetic recording medium having opaque polyester film base
    Patent number: 4546036
    Abstract: A magnetic recording medium has a biaxially-oriented polyester film base which includes carbon black beads having a median diameter from 50 to 500 nm and is substantially free from beads or agglomerates more than 5 micrometers in diameter. The beads provide opacity such as is often required of the flexible recording disk of a diskette. The film base may be either a single layer, throughout which the beads are uniformly dispersed, or it may be multi-layer, e.g., a central layer containing the carbon black beads and two surface layers which are free from the beads.
    Type: Grant
    Filed: December 22, 1983
    Date of Patent: October 8, 1985
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Brenda L. Renalls, Douglas G. Pedrotty, John F. Donlan