Patents by Inventor James A. Charles

James A. Charles 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).

  • Metal separation process
    Patent number: 4869790
    Abstract: An electrolytic cell for the electrolysis of molten salt having rotatable anode and cathode electrodes in a container for the molten electrolyte. The electrodes are conical in shape and have vent holes facilitating removal of evolved gases from the electrode surfaces. The liberated metal is thrown from the electrode and collected. The electrodes may be arranged in a symmetrical stack.
    Type: Grant
    Filed: June 13, 1988
    Date of Patent: September 26, 1989
    Assignee: The British Petroleum Company p.l.c.
    Inventors: James A. Charles, Piers M. Copham, Derek J. Fray
  • Speed change mechanism with load bearing saddle
    Patent number: 4354396
    Abstract: A speed change mechanism of the type having a gear change yoke actuated by a travelling ball nut on a screw includes a load-bearing saddle slidably mounted over the nut. The saddle provides for avoidance of radial loads on the nut and screw via the yoke, while allowing for transmission of axial loads between said members. The yoke moves between first and second limits of movement and contains a provision for relief of axial loads to the nut and screw whenever the yoke is positioned at either of said limits.
    Type: Grant
    Filed: May 22, 1980
    Date of Patent: October 19, 1982
    Assignee: Dana Corporation
    Inventor: James A. Charles
  • Sulphide pellet materials
    Patent number: 4274878
    Abstract: A substantially spherical pellet composed predominantly of lead sulphide which is coated with predominantly zinc sulphide material. The lead sulphide core is from 2-6 mm in diameter and the zinc sulphide coating has a thickness of from 1-3 mm. The weight ratio of zinc sulphide to lead sulphide is from 1.5:1 to 2.5:1.
    Type: Grant
    Filed: May 12, 1980
    Date of Patent: June 23, 1981
    Assignees: Metallurgical Processes Limited, I.S.C. Smelting
    Inventor: James A. Charles
  • Roasting of sulphide materials
    Patent number: 4231791
    Abstract: A process for roasting zinc/lead sulphide materials, comprising forming substantially spherical pellets composed predominantly of lead sulphide, coating these with predominantly zinc sulphide material, and then roasting the coated pellets in a roasting apparatus to effect oxidation of sulphide, predominantly to oxide.
    Type: Grant
    Filed: July 5, 1979
    Date of Patent: November 4, 1980
    Assignees: Metallurgical Processes Ltd., I.S.C. Smelting Ltd.
    Inventor: James A. Charles