Patents by Inventor Dennis A. Lawrenz

Dennis A. Lawrenz 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).

  • Molten metal sampling device
    Patent number: 4646578
    Abstract: A sampling device for obtaining samples from a molten metal bath includes a pair of concentric vitreous tubes spaced from one another and coupled to each other such that the inner tube can be readily removed once the sample is taken. The outer tube is cylindrical and includes a restriction at one end defining a circular opening smaller than an adjacent end of the inner tube for supporting the end of the inner tube.
    Type: Grant
    Filed: April 30, 1985
    Date of Patent: March 3, 1987
    Assignee: Leco Corporation
    Inventors: Dennis A. Lawrenz, Ken A. Rinkenberg
  • Frangible molten metal sampling device
    Patent number: 4643032
    Abstract: A sampling device for obtaining samples from a molten metal bath includes a pair of concentric tubes spaced from one another and coupled at at least one end by a frangible interconnection such that the inner tube can be readily removed once the sample is taken and the frangible connection broken.
    Type: Grant
    Filed: April 30, 1985
    Date of Patent: February 17, 1987
    Assignee: Leco Corporation
    Inventors: Dennis A. Lawrenz, Ken A. Rinkenberg
  • Sampling tube
    Patent number: 4624149
    Abstract: A sampling tube includes a sealed metallic tube having a fusible end cap at an extending end which, when submerged in a molten bath, admits the molten sample into the evacuated tube. The tube has a liner which is either frangible or has a nonadhering surface defining a substantially uniform, cross-sectional diameter to freely allow the molten sample to enter the tube and solidify in the liner as the sample tube is removed.
    Type: Grant
    Filed: February 19, 1985
    Date of Patent: November 25, 1986
    Assignee: Leco Corporation
    Inventors: Dennis A. Lawrenz, Ken A. Rinkenberg