Patents by Inventor David T. Anzulewicz

David T. Anzulewicz 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: 5551478
    Abstract: A hydraulic control system for a jet aircraft engine has an electronic control that commands a pair of torque motors to ultimately control the position of each one of a plurality of two-position, "latching" hydraulic actuator valves. A first torque motor is operable with a three-position, on/off hydraulic valve. The second torque motor operates in conjunction with a second valve to control the linear position of the spool of a multiplexer selector valve. The multiplexer selector valve has a plurality of positions that the spool can be linear translatable to. At each position is located a pair of control ports to which are ultimately connected one side of each of a pair of corresponding hydraulic actuator valves. The actuator valves may comprise fuel or air valves.
    Type: Grant
    Filed: October 21, 1994
    Date of Patent: September 3, 1996
    Assignee: United Technologies Corporation
    Inventors: Leo J. Veilleux, Jr., David T. Anzulewicz, Gerald P. Dyer