Patents by Inventor Anthony S. Au

Anthony S. Au 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).

  • Pressure control systems
    Patent number: 4333452
    Abstract: A pneumatically controlled pressure relief valve and various systems incorporating a pneumatically controlled pressure relief valve. The valve has a flexible valve closure member which is expandable to close a through passage of the valve and includes a pressure chamber disposed externally of the valve passage and isolated from the through passage by the flexible valve closure member so that the valve may open and close in response to the differential between the pressure in the pressure chamber and the pressure in the through passage of the valve. An input passage opens into the pressure chamber for admitting air and a manually operable valve is provided for opening and closing the input passage to regulate the admission of air. The systems incorporating the valve include an inflatable cuff system for a tracheal or endotracheal tube, a positive end expiratory pressure system and a suction system incorporating a suction catheter.
    Type: Grant
    Filed: August 7, 1979
    Date of Patent: June 8, 1982
    Inventor: Anthony S. Au
  • Pressure control systems
    Patent number: 4178938
    Abstract: A pneumatically controlled pressure relief valve and various systems incorporating a pneumatically controlled pressure relief valve. The valve has a flexible valve closure member which is expandable to close a through passage of the valve and includes a pressure chamber disposed externally of the valve passage and isolated from the through passage by the flexible valve closure member so that the valve may open and close in response to the differential between the pressure in the pressure chamber and the pressure in the through passage of the valve. An input passage opens into the pressure chamber for admitting air and a manually operable valve is provided for opening and closing the input passage to regulate the admission of air. The systems incorporating the valve include an inflatable cuff system for a tracheal or endotracheal tube, a positive end expiratory pressure system and a suction system incorporating a suction catheter.
    Type: Grant
    Filed: June 24, 1977
    Date of Patent: December 18, 1979
    Inventor: Anthony S. Au
  • Pressure control systems
    Patent number: 4178940
    Abstract: A pneumatically controlled pressure relief valve and various systems incorporating a pneumatically controlled pressure relief valve. The valve has a flexible valve closure member which is expandable to close a through passage of the valve and includes a pressure chamber disposed externally of the valve passage and isolated from the through passage by the flexible valve closure member so that the valve may open and close in response to the differential between the pressure in the pressure chamber and the pressure in the through passage of the valve. An input passage opens into the pressure chamber for admitting air and a manually operable valve is provided for opening and closing the input passage to regulate the admission of air. The systems incorporating the valve include an inflatable cuff system for a tracheal or endotracheal tube, a positive end expiratory pressure system and a suction system incorporating a suction catheter.
    Type: Grant
    Filed: February 15, 1978
    Date of Patent: December 18, 1979
    Inventor: Anthony S. Au