Patents by Inventor Donald R. Johannsen

Donald R. Johannsen 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).

  • Patent number: 4538382
    Abstract: An improved apparatus for sharpening the cutting edge of a knife blade or other cutting implement including a frame assembly having clamping means for securing the blade thereto and guide means for maintaining an abrading means or an abrading assembly in a substantially constant angular relationship with the blade. The apparatus also includes means for accommodating a variety of blade sizes and thicknesses as well as means for performing abrading operations varying from coarse to fine on the blade without changing or rotating the abrading assembly. Handle means are also provided and include shield means for protecting the hands of the user.
    Type: Grant
    Filed: December 1, 1983
    Date of Patent: September 3, 1985
    Assignee: Bonni S. Carris
    Inventor: Donald R. Johannsen
  • Patent number: 4299044
    Abstract: In combination with a firearm having a barrel with front and rear sights, a telescopic sight of one diameter spaced above and parallel to the barrel. An elongated land is secured upon the barrel with opposed elongated outwardly opening V-slots therein. A pair of longitudinally spaced reversible telescopic sight mounts supportably engage the telescopic sight and are adjustably secured to the land. Each sight mount includes a pair of opposed symmetrical scope brackets. Each bracket comprises an arcuate top wall with a tapered longitudinal edge and with an internal semi-circular face of a first radius; an arcuate bottom wall with a tapered longitudinal edge and an internal semicircular face of a second radius, and a centrally apertured abutment interconnecting the top and bottom walls. Opposed pairs of top walls receive therebetween opposed sides of the telescopic sight and the edges of the bottom walls project into the grooves on opposite sides of the land.
    Type: Grant
    Filed: September 17, 1979
    Date of Patent: November 10, 1981
    Assignee: Wideview Scope Mount Corporation
    Inventor: Donald R. Johannsen
  • Patent number: D268639
    Type: Grant
    Filed: August 3, 1981
    Date of Patent: April 19, 1983
    Inventor: Donald R. Johannsen
  • Patent number: D287815
    Type: Grant
    Filed: January 13, 1984
    Date of Patent: January 20, 1987
    Assignee: Bonnis S. Carris
    Inventor: Donald R. Johannsen
  • Patent number: D298060
    Type: Grant
    Filed: April 8, 1986
    Date of Patent: October 11, 1988
    Inventor: Donald R. Johannsen
  • Patent number: D319374
    Type: Grant
    Filed: April 3, 1989
    Date of Patent: August 27, 1991
    Inventor: Donald R. Johannsen