Patents by Inventor James C. Erskine

James C. Erskine 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: 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.
  • 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.
  • Patent number: 5243858
    Abstract: An airflow sensor formed on a silicon chip comprises a silicon base covered with an insulating polyimide layer, a lineal resistance heater on the chip energized with current pulses to propagate thermal waves, and a thermistor on the chip downstream of the heater to detect the arrival of each thermal wave. Circuitry determines flow rate as a function of the measured propagation time of the thermal wave. The thermistor may be replaced by a bridge of four resistive elements of which only one or two are sensitive to the thermal wave. The thermistor material is platinum, polycrystalline silicon or amorphous silicon which exhibit high temperature coefficients of resistance.
    Type: Grant
    Filed: August 12, 1991
    Date of Patent: September 14, 1993
    Assignee: General Motors Corporation
    Inventors: James C. Erskine, David K. Lambert, Charles R. Harrington
  • Patent number: 4893509
    Abstract: A resonant bridge microaccelerometer is formed using patterned Silicon-on-Insulator (SOI) material. A buried layer is formed in the silicon substrate using preferably oxygen ion implanting techniques. A predetermined proof mass is subsequently formed by selective deposition of an appropriate material on an epitaxially grown layer of silicon generally over the buried layer. The buried layer is subsequently removed by a hydrofluoric acid etch, thereby forming a gap generally everywhere therebetween the proof mass and the supporting silicon substrate, and delineating the resonant microbridges within the microaccelerometer.
    Type: Grant
    Filed: December 27, 1988
    Date of Patent: January 16, 1990
    Assignee: General Motors Corporation
    Inventors: Bernard A. MacIver, James C. Erskine
  • Patent number: 4881512
    Abstract: An ignition system for a spark ignited internal combustion engine wherein a source of high direct voltage is connected to a spark plug by a solid-state high voltage switch. The switch comprises a plurality of series connected metal oxide semiconductor field effect transistors which form a first string of series connected transistors. The system has a second string of series connected field effect transistors. The second string is connected in parallel with the spark plug and the second string is biased conductive when the first string is biased nonconductive. The system has a third string of series connected field effect transistors which operate as a voltage level shifter. The individual transistors that form the strings are mounted on common substrates formed of an insulating material such as sapphire.
    Type: Grant
    Filed: August 31, 1988
    Date of Patent: November 21, 1989
    Assignee: General Motors Corporation
    Inventors: James C. Erskine, Stephen J. Valeri
  • Patent number: 4851363
    Abstract: A method of fabricating polycrystalline silicon thin film field effect transistors on low cost alkaline earth alumino-silicate glass substrates which can tolerate device processing temperatures of approximately 800.degree. C.
    Type: Grant
    Filed: March 21, 1988
    Date of Patent: July 25, 1989
    Assignee: General Motors Corporation
    Inventors: John R. Troxell, Marie I. Harrington, James C. Erskine
  • Patent number: 4769685
    Abstract: An insulated gate field effect transistor of the depletion mode type has a recessed gate structure with opposed gate sections on opposite sides of adjacent bar-like structures defined in a channel region. An opposite conductivity-type island in the channel region is electrically connected to the transistor gate electrode. A voltage applied to the gate electrode generates an electric field effect which extends from the opposed gate sections into said bar-like structures creating opposed depletion regions which modulate channel current. The gate voltage simultaneously biases the island to enhance the gate electric field effect by removing minority charge carriers which would otherwise accumulate in the bar-like structures.
    Type: Grant
    Filed: October 27, 1986
    Date of Patent: September 6, 1988
    Assignee: General Motors Corporation
    Inventors: Bernard A. MacIver, James C. Erskine
  • 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
  • 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
  • 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