Patents by Inventor David A. Everett

David A. Everett 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: 6131555
    Abstract: A system for controlling ignition energy of an internal combustion engine includes an ignition coil having a primary coil and a secondary coil coupled to first and second electrodes of an ignition plug defining a spark gap therebetween, wherein the primary coil is operable to induce a spark voltage across the secondary coil and across the spark gap. The secondary coil is responsive to the spark voltage to produce a discharge current across the spark gap of the ignition plug. In accordance with one aspect of the invention, means are provided for controllably shunting the primary coil to thereby control the duration of discharge current across the spark gap of the ignition plug. In accordance with another aspect of the present invention, means are further provided for drawing discharge current away from the ignition plug to thereby limit the magnitude of the discharge current within some time period after the transfer of energy from the primary coil to the secondary coil begins.
    Type: Grant
    Filed: June 9, 1999
    Date of Patent: October 17, 2000
    Assignee: Cummins Engine Company, Inc.
    Inventors: Luigi P. Tozzi, Stephen Goldschmidt, David A. Everett, Bryan S. Gatewood
  • Patent number: 5638431
    Abstract: The present invention telecommunications system provides validation of authorization codes input by a user for placing a call from a service area of a first telecommunications service provider with a calling card issued by another telecommunications service provider. The present invention allows the subscriber to place a special service call irrespective of whether the signaling protocol of the first service provider is different from the service provider to which the subscriber is a customer of. If the protocol of one telecommunications service provider is indeed different from the other service provider, a gateway residing in an intelligent service network node would convert the signaling protocol of the first service provider into a signaling protocol that is compatible with the other service provider.
    Type: Grant
    Filed: May 1, 1995
    Date of Patent: June 10, 1997
    Assignee: MCI Corporation
    Inventors: David A. Everett, Gary W. Leopold, George M. Kult, Lee C. Seydel, Padmanabhan Vijay