Patents by Inventor William Henry Topham

William Henry Topham 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).

  • Sampling device
    Patent number: 4037475
    Abstract: A sampling device for insuring a constant rate of sample flow from a conduit regardless of conduit pressure and medium viscosity, particularly in the high pressure and low viscosity ranges. In addition to the constant displacment pump a back pressure valve provides a constant pressure differential across the pump so that "slip" is maintained constant.
    Type: Grant
    Filed: March 23, 1976
    Date of Patent: July 26, 1977
    Assignee: The British Petroleum Company Limited
    Inventor: William Henry Topham
  • Viscometer
    Patent number: 3977235
    Abstract: An on-line monitoring device comprises a constant volume flow rate pump connected in series with a heater and a hydraulic resistance. A differential pressure transmitter is connected across the resistance and connected to a controller. The controller adjusts the power supply to the heater so that, in use, a pre-determined differential pressure across the resistance is maintained. At least one temperature is associated with the hydraulic resistance.
    Type: Grant
    Filed: March 3, 1975
    Date of Patent: August 31, 1976
    Assignee: The British Petroleum Company Limited
    Inventor: William Henry Topham