Patents by Inventor William S. Swindall

William S. Swindall 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).

  • Grade and cross fall reference device for highway survey vehicles
    Patent number: 4674327
    Abstract: In a highway survey vehicle, grade and cross fall measurements are made in relation to references established by a displacement type pitch and roll gyroscope with a gravity referenced erection system. Lateral acceleration of the vehicle is calculated independently and used to provide a correction for errors caused by spurious erection induced by such lateral acceleration, provided that such acceleration falls within certain limits such as to permit effective correction. The lateral acceleration may be calculated from measured rates of displacement and change of the direction of the vehicle.
    Type: Grant
    Filed: March 17, 1986
    Date of Patent: June 23, 1987
    Assignee: Highway Products International Inc.
    Inventors: William S. Swindall, Brian R. Campbell, Donald H. Kobi
  • Anvil with trapped fluid
    Patent number: 4325437
    Abstract: A hydraulic impactor having a reciprocating piston, a liquid coupling having a stepped bore and an actuatable driven member of a configuration to obtain the optimum energy transfer to the driven member.
    Type: Grant
    Filed: April 28, 1980
    Date of Patent: April 20, 1982
    Assignee: Joy Manufacturing Company
    Inventors: William S. Swindall, Anil Mahyera