Patents by Inventor John W. Mitchell, Sr.

John W. Mitchell, Sr. 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: 4436511
    Abstract: A dental press or jig for rigidly positioning during a short curing period, a matching pair of dentures held in occlusal alignment with one or both having a contacting layer of relining material pressed against a respective model of the patient's mouth, all clamped together by the press within a body of plaster of Paris. The laterally-open press is formed of a pair of annular plates or disks, vertically spaced apart a constant distance by three, upstanding, peripheral posts which are thus tensioned against opposite faces of the composite workpiece. Each plate is formed with plaster escape-channels leading to catch basins on the outer faces, the basins being defined by a reinforcing pattern of diametric ribs within a peripheral rim which render the plates unbendable under pressure. The assembly may be molded of glass-reinforced terephthalate resin for high tensile and flex resistant properties.
    Type: Grant
    Filed: August 26, 1982
    Date of Patent: March 13, 1984
    Inventor: John W. Mitchell, Sr.
  • Patent number: 4182238
    Abstract: A transparent, generally cylindrical, wide-mouth pressure retaining vessel or container cast of synthetic resin with a surrounding side wall formed by successively downwardly inset, annular wall segments, and externally reinforced by integral vertical ribs with successive annular edges of the inner stepped face providing support ledges adapted to hold removable shelves upon which freshly cast dentures, acrylic hobby items, pressure-curable art objects, etc. as well as fermentable foodstuff and gas-generating chemicals may be placed for exposure to externally applied and/or internally generated fluid pressure (gas or liquid). Necessity for retention clamps is eliminated by a threadedly mounted closure which carries a manually operable, threaded piston stem disposing a piston in an open-bottom chamber of the cover, which chamber projecting into a container full of liquid causes the latter to fill the piston chamber upon the cover being mounted on the container.
    Type: Grant
    Filed: January 23, 1978
    Date of Patent: January 8, 1980
    Inventors: John W. Mitchell, Sr., Kenneth H. Oyama, John K. Lawler, deceased, by Doris G. Lawler, executrix
  • Patent number: 4164074
    Abstract: Dental articulator formed with individually adjustable, upper and lower carrier plates, each having means for quick-coupling to one of an interchangeable pair of planar mounts (each mount adapted to adhesively support an assembled denture against one of its faces). A pair of matching dentures can thus be assembled either within or away from the articulator, mounted and tested for occlusion therein, and subsequently reworked (as often as necessary) either within or when removed from the articulator. Essentially a pair of thrust-coupling or threaded attachment means on the carrier plate or on the mount, engage corresponding sockets of the opposite member. Formulation of the mount of inexpensive plastic enables discard after single use.
    Type: Grant
    Filed: November 5, 1976
    Date of Patent: August 14, 1979
    Assignee: Doris Gene Lawler
    Inventors: John K. Lawler, deceased, John W. Mitchell, Sr., Kenneth H. Oyama
  • Patent number: D251681
    Type: Grant
    Filed: February 10, 1977
    Date of Patent: April 24, 1979
    Inventors: John K. Lawler, deceased, by Doris G. Lawler, executrix, John W. Mitchell, Sr., Kenneth H. Oyama
  • Patent number: D251683
    Type: Grant
    Filed: January 23, 1978
    Date of Patent: April 24, 1979
    Inventors: John W. Mitchell, Sr., Kenneth H. Oyama, John K. Lawler, deceased, by Doris G. Lawler, executrix
  • Patent number: D278273
    Type: Grant
    Filed: June 2, 1982
    Date of Patent: April 2, 1985
    Inventor: John W. Mitchell, Sr.
  • Patent number: D279816
    Type: Grant
    Filed: June 4, 1982
    Date of Patent: July 23, 1985
    Inventor: John W. Mitchell, Sr.