Patents by Inventor Vance C. Mitchell

Vance C. Mitchell 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).

  • Patterned plastic optical components
    Patent number: 5128802
    Abstract: A transparent plastic slide for microscopic examination of fluids with at least one grid defined on the floor portion of the slide. The grid consisting of lines rising symmetrically from the floor portion of the slide with a line width of from about 0.05 to 0.005 mm. The lines defining enclosed areas, in which particles suspended in sample fluids can be counted. The sizes of enclosed areas being selected to be within the field of view for microscopic examination.
    Type: Grant
    Filed: July 8, 1991
    Date of Patent: July 7, 1992
    Assignee: Hycor Biomedical
    Inventor: Vance C. Mitchell
  • Examination slide grid system
    Patent number: 4997266
    Abstract: A method of forming an eroded pattern on a metal part using Electrical Discharge Machining (EDM) comprising: forming a pattern of electrodes on the end of a piece of electrode material by using wire EDM, the pattern of electrodes being the pattern to be eroded on the metal part or being a portion of the pattern; and mounting the metal part for EDM with the pattern of electrodes being mounted for use as electrodes and the erosion of the pattern or portion of the pattern provided by the pattern of electrodes by EDM in the metal part.
    Type: Grant
    Filed: May 9, 1990
    Date of Patent: March 5, 1991
    Assignee: Hycor Biomedical, Inc.
    Inventor: Vance C. Mitchell
  • Examination slide grid system
    Patent number: 4937415
    Abstract: A method of forming an eroded pattern on a metal part using Electrical Discharge Machining (EDM) comprising: forming a pattern of electrodes on the end of a piece of electrode material by using wire EDM, the pattern of electrodes being the pattern to be eroded on the metal part or being a portion of the pattern; and mounting the metal part for EDM with the pattern of electrodes being mounted for use as electrodes and the erosion of the pattern or portion of the pattern provided by the pattern of electrodes by EDM in the metal part.
    Type: Grant
    Filed: February 22, 1989
    Date of Patent: June 26, 1990
    Assignee: Hycor Biomedical, Inc.
    Inventor: Vance C. Mitchell
  • Microscope inspection slide
    Patent number: 4637693
    Abstract: A microscope inspection slide including at least one examination chamber formed by bonding together a base plate and a cover plate. The base plate having a chamber floor surface raised above a deck surface on the base plate, and the cover plate having a roof surface with a depth control ridge positioned about a portion of the edge of the chamber roof surface. Bonding the cover plate to the base plate forms an examination chamber with the distance between the roof surface and floor surface maintained constant, and entrapped gases and excess fluid allowed to drain from the examination chamber through notches in the depth control ridge.
    Type: Grant
    Filed: July 23, 1985
    Date of Patent: January 20, 1987
    Assignee: ICL Scientific Corp.
    Inventor: Vance C. Mitchell
  • Liquid sampling apparatus with retention means
    Patent number: 4563332
    Abstract: An apparatus for preparing a sample of liquid for examination and analysis. The apparatus includes a tube closed at one end and open at the other, and a pipette dimensioned for insertion into the tube. The pipette has a sealing surface which is slightly smaller in diameter than the inside diameter of the tube. Protruding from the sealing surface is a rib which is aligned along the longitudinal axes of the pipette and which engages a portion of the inside wall of the tube to maintain the pipette in the tube.
    Type: Grant
    Filed: April 27, 1983
    Date of Patent: January 7, 1986
    Assignee: ICL Scientific, Inc.
    Inventors: Vance C. Mitchell, Thomas A. Safstron
  • Microscope inspection slide
    Patent number: RE33826
    Abstract: A microscope inspection slide including at least one examination chamber formed by bonding together a base plate and a cover plate. The base plate having a chamber floor surface raised above a deck surface on the base plate, and the cover plate having a roof surface with a depth control ridge positioned about a portion of the edge of the chamber roof surface. Bonding the cover plate to the base plate forms an examination chamber with the distance between the roof surface and floor surface maintained constant, and entrapped gases and excess fluid allowed to drain from the examination chamber through notches in the depth control ridge.
    Type: Grant
    Filed: September 7, 1989
    Date of Patent: February 18, 1992
    Assignee: Hycor Biomedical, Inc.
    Inventor: Vance C. Mitchell
  • Wand for determining drug test result
    Patent number: D333185
    Type: Grant
    Filed: August 13, 1990
    Date of Patent: February 9, 1993
    Assignee: Hycor Biomedical, Inc.
    Inventors: Mark Andersen, John von Buelow, Denise C. Garrison, Vance C. Mitchell, Nelson F. Thune, Leonard Porche