Patents by Inventor David L. Johnson

David L. Johnson 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).

  • Pre-stressed impact testing device
    Patent number: 4442697
    Abstract: A pre-stressed impact testing device designed to measure the energy which is absorbed during fracture of metal samples under pre-stressed conditions. The device includes a base portion and a pendulum supporting portion which is positioned thereabove. The base portion includes first and second elongated and horizontally spaced-apart beams having opposite ends with a third beam secured to and extending between the first and second beams at one end thereof. A hydraulic ram is secured to and extends between the other ends of the first and second beams for selectively moving the other ends of the first and second beams away from each other so that the first and second beams will be elastically stressed. Connectors are provided on each of the first and second beams for attachment to the opposite ends of the sample material whereby the sample material will be placed in stress when the first and second beams are elastically stressed.
    Type: Grant
    Filed: March 19, 1982
    Date of Patent: April 17, 1984
    Assignee: InterNorth, Inc.
    Inventors: Brian L. Jones, David L. Johnson, Merlin H. Moseman
  • Antibiotic purification process
    Patent number: 4189568
    Abstract: Carminomycin 1, a known antibiotic, is obtained in a highly purified form from crude fermentation solids containing it by use of a novel multistep purification process involving solvent extraction, countercurrent distribution and adsorption chromatography.
    Type: Grant
    Filed: February 8, 1978
    Date of Patent: February 19, 1980
    Assignee: Bristol-Myers Company
    Inventors: David L. Johnson, Terrence W. Doyle
  • Adapter for preloading bearings
    Patent number: 4159750
    Abstract: An adapter particularly suited for use in preloading bearings in the final drive of a crawler-type vehicle, including a plate adapted to be mounted concentrically with the sprocket shaft of a final drive, securing devices associated with the plate for securing the plate in concentric relation to the sprocket shaft, a stub shaft extending from one side of the plate, an arm rotatably mounted on the stub shaft and having a radial part extending beyond the periphery of the plate and an axial part terminating in an end on the side of the plate opposite of the stub shaft, a jaw mounted on the end of the arm and adapted to engage a bearing adjusting nut on the final drive, and a torque receiving formation on the arm for receiving a rotative force from a torque wrench or the like and being generally concentrically located with respect to the stub shaft.
    Type: Grant
    Filed: November 4, 1977
    Date of Patent: July 3, 1979
    Assignee: Caterpillar Tractor Co.
    Inventors: Robert E. Brown, David L. Johnson, John F. Lindquist