Patents by Inventor James C. Erskine, Jr.

James C. Erskine, Jr. 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).

  • Zero current switching between winding sets in a permanent magnet alternator having a split winding stator
    Patent number: 5510696
    Abstract: An apparatus for selectively rectifying one of a pair of output voltages associated with one of a a pair of output winding sets of a polyphase alternating current generator has a single controlled bridge rectifier selectively coupled to one of the winding sets. The bridge rectifier is selectively coupled in accordance with a predetermined rotational speed of the rotor. Transitions between the two winding sets is caused to occur at zero current conditions of the windings.
    Type: Grant
    Filed: November 3, 1994
    Date of Patent: April 23, 1996
    Assignee: General Motors Corporation
    Inventors: Malakondaiah Naidu, James C. Erskine, Jr.
  • Low mechanical stress, high electrical and thermal conductance semiconductor die mount
    Patent number: 5510650
    Abstract: This invention includes semiconductor devices including the heat sink with a slitted metal strip, such as copper, which is coiled or folded to produce an array of flexible flat fingers for mechanical, thermal and electrical contact with the silicon die, such as a power transistor. The use of a slitted metal strip instead of a bundle of wires makes fabrication of the flexible mount simpler and more economical. The flexible flat fingers are able to accommodate hot spots on the semiconductor device and change in thermal gradients as the device is operated.
    Type: Grant
    Filed: September 2, 1994
    Date of Patent: April 23, 1996
    Assignee: General Motors Corporation
    Inventor: James C. Erskine, Jr.
  • Method of making adherent score-resistant coating for metals
    Patent number: 4618505
    Abstract: A bearing element having an adherent score-resistant coating on its surface comprising a carbonized layer of an organic resin in which the layer is carbonized by ion implantation. The ion implantation is controlled to not only provide graphite-like and diamond-like structures in the carbonized coating but to also produce chemical bonding between carbon atoms of the resultant coating and atoms of the bearing surface.
    Type: Grant
    Filed: August 19, 1985
    Date of Patent: October 21, 1986
    Assignee: General Motors Corporation
    Inventors: Bernard A. MacIver, James C. Erskine, Jr., John C. Bierlein
  • Metal bearing surface having an adherent score-resistant coating
    Patent number: 4554208
    Abstract: A bearing element having an adherent score-resistant coating on its surface comprising a carbonized layer of an organic resin in which the layer is carbonized by ion implantation. The ion implantation is controlled to not only provide graphite-like and diamond-like structures in the carbonized coating but to also produce chemical bonding between carbon atoms of the resultant coating and atoms of the bearing surface.
    Type: Grant
    Filed: November 23, 1984
    Date of Patent: November 19, 1985
    Assignee: General Motors Corporation
    Inventors: Bernard A. MacIver, James C. Erskine, Jr., John C. Bierlein
  • Metal bearing element with a score-resistant coating
    Patent number: 4540636
    Abstract: A bearing element having an adherent score-resistant coating on its surface comprising a carbonized layer of an organic resin in which the layer is carbonized by ion implantation. The ion implantation is controlled to not only provide graphite-like and diamond-like structures in the carbonized coating but to also produce chemical bonding between carbon atoms of the resultant coating and atoms of the bearing surface.
    Type: Grant
    Filed: December 27, 1983
    Date of Patent: September 10, 1985
    Assignee: General Motors Corporation
    Inventors: Bernard A. Mac Iver, James C. Erskine, Jr., John C. Bierlein