Patents by Inventor Dennis L. Plackard

Dennis L. Plackard 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 of making self-aligning anisotropic powder for magnets
    Patent number: 5026438
    Abstract: A method is provided for comminuting and mechanically magnetically orienting particles of hot worked rare earth-transition metal-boron alloy to make bonded anistropic magnets. The method involves comminuting a hot-worked body of the alloy to form platelet shaped particles, and applying pressure to the particles in a die in the absence of an external magnetic field.
    Type: Grant
    Filed: October 5, 1989
    Date of Patent: June 25, 1991
    Assignee: General Motors Corporation
    Inventors: Kevin A. Young, Dennis L. Plackard
  • Ultrasonic compacting and bonding particles
    Patent number: 4957668
    Abstract: A method of concurrently compacting and bonding a plurality of solid particles together including combining particles with a thermobonding agent, placing the particle-agent combination in a die having a desired shape, and applying compaction pressure to the particles while concurrently applying sufficient ultrasonic energy to the particles to densify the particles and thermally activate the thermobonding agent.
    Type: Grant
    Filed: December 7, 1988
    Date of Patent: September 18, 1990
    Assignee: General Motors Corporation
    Inventors: Dennis L. Plackard, William J. Chafin