Patents by Inventor Gertjan Roelof Bouwkamp

Gertjan Roelof Bouwkamp 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).

  • Device for controlling a liquid flow
    Patent number: 6474356
    Abstract: A device for controlling a liquid flow by a gas pressure. The device includes a pressure chamber, in which an overpressure, an underpressure or atmospheric pressure may prevail. The pressure in the pressure chamber can be used for allowing the liquid flow to pass or for stopping the liquid flow. Furthermore the liquid flow can be limited to a predetermined rate of flow. The device may interalia be used in sewage systems, hydraulic engineering works and irrigation works.
    Type: Grant
    Filed: November 8, 2001
    Date of Patent: November 5, 2002
    Inventor: Gertjan Roelof Bouwkamp
  • Device for controlling a liquid flow
    Publication number: 20020043283
    Abstract: A device for controlling a liquid flow by a gas pressure. The device includes a pressure chamber, in which an overpressure, an underpressure or atmospheric pressure may prevail. The pressure in the pressure chamber can be used for allowing the liquid flow to pass or for stopping the liquid flow. Furthermore the liquid flow can be limited to a predetermined rate of flow. The device may interalia be used in sewage systems, hydraulic engineering works and irrigation works.
    Type: Application
    Filed: November 8, 2001
    Publication date: April 18, 2002
    Inventor: Gertjan Roelof Bouwkamp