Patents by Inventor Robert A. Wandmacher

Robert A. Wandmacher 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).

  • Stress control for termination of a high voltage cable
    Patent number: 6340794
    Abstract: A two-part system for electrical stress control includes a conformable stress control material positioned at the shield cut edge of a prepared power cable and a stress control tube over the conformable stress control material. A second region of conformable stress control material is positioned adjacent the cut end of the insulation. Relationships are revealed which relate the permittivity and dimensional parameters of the two components.
    Type: Grant
    Filed: December 16, 1996
    Date of Patent: January 22, 2002
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Robert A. Wandmacher, Lawrence C. Chor, John T. Larson
  • Stress control for termination of a high voltage cable
    Patent number: 6015629
    Abstract: A two-part system for electrical stress control includes a non-tacky conformable stress control material that is positioned at the shield cut edge of a prepared power cable and a stress control tube over the non-tacky conformable stress control material. A second region of conformable stress control material is positioned adjacent the cut end of the insulation.
    Type: Grant
    Filed: September 4, 1998
    Date of Patent: January 18, 2000
    Assignee: 3M Innovative Properties Company
    Inventors: Thomas J. D. Heyer, Robert A. Wandmacher, Lawrence C. Chor, John T. Larson
  • Epihalohydrin electrical stress controlling material
    Patent number: 5962569
    Abstract: A non-tacky electrical stress control material comprisinga) about 100 parts of a resin component containing1) from about 20% to about 80% of an epihalohydrin polymer, and2) correspondingly, from about 80% to about 20% of an insulating silicone polymer having a tan .delta. of less than one,b) from about 10 to about 200 parts of a filler, said filler being nonconductive at room temperature, selected from the group consisting of barium titanate and hydrated aluminum silicate, andc) from 0 to 30 parts of a plasticizer.
    Type: Grant
    Filed: June 23, 1998
    Date of Patent: October 5, 1999
    Assignee: 3M Innovative Properties Company
    Inventors: Thomas J. D. Heyer, Robert A. Wandmacher
  • Epihalohydrin electrical stress controlling material
    Patent number: 5804630
    Abstract: A non-tacky electrical stress control material comprisinga) about 100 parts of a resin component containing1) from about 20% to about 80% of an epihalohydrin polymer, and2) correspondingly, from about 80% to about 20% of an insulating silicone polymer having a tan .delta. of less than one,b) from about 10 to about 200 parts of a filler, said filler being nonconductive at room temperature, selected from the group consisting of barium titanate and hydrated aluminum silicate, andc) from 0 to 30 parts of a plasticizer.
    Type: Grant
    Filed: August 8, 1996
    Date of Patent: September 8, 1998
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Thomas J. D. Heyer, Robert A. Wandmacher
  • Faraday-effect sensing coil with stable birefringence and method of making same
    Patent number: 5553173
    Abstract: A fiber optic, Faraday-effect sensing coil has very low linear and circular birefringence, which remains stable over a wide range of temperatures. The coil is fabricated from a spun fiber having an effective linear beat length of 100 meters or more, and is annealed after being formed into the coil. The coil has improved discrimination for magnetic fields associated with electric current-carrying cables, and may be incorporated into an optical current transducer (OCT), either interferometric or polarimetric.
    Type: Grant
    Filed: February 23, 1995
    Date of Patent: September 3, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Dale R. Lutz, Trevor W. MacDougall, William L. Taylor, Wayne F. Varner, Robert A. Wandmacher
  • Faraday-effect sensing coil with stable birefringence
    Patent number: 5463312
    Abstract: A fiber optic, Faraday-effect sensing coil has very low linear and circular birefringence, which remains stable over a wide range of temperatures. The coil is fabricated from a spun fiber having an effective linear beat length of 100 meters or more, and is annealed after being formed into the coil. The coil has improved discrimination for magnetic fields associated with electric current-carrying cables, and may be incorporated into an optical current transducer (OCT), either interferometric or polarimetric.
    Type: Grant
    Filed: March 3, 1994
    Date of Patent: October 31, 1995
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Dale R. Lutz, Trevor W. MacDougall, William L. Taylor, Wayne F. Varner, Robert A. Wandmacher
  • Voice/data communication termination connector
    Patent number: 4789354
    Abstract: A connector for communication wire pairs has an insulating body formed with sinuous channels for capturing the insulated wire, U-slot contact elements for making contact with the wires and said contacts having spring elements formed by U-shaped cuts in the periphery of the element for contact with an external circuit to connect the same in series or parallel with said spliced wires.
    Type: Grant
    Filed: September 14, 1987
    Date of Patent: December 6, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Philip M. Smith, Elmont E. Hollingsworth, Robert A. Wandmacher, Thomas W. Rosckes, Russell A. Roiko, Dennis M. Cheesebrow