Patents by Inventor Charles G. Murray

Charles G. Murray 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: 5411052
    Abstract: Liquid supply apparatus is disclosed for controlling the supply of liquid to humidifier apparatus. The liquid supply apparatus has a chamber with an inlet through which a liquid such as water is supplied to the chamber. The chamber has a flow detector to detect liquid entering the chamber and a level detector near the base of the chamber in a narrow portion of the chamber which, in conjunction with a calibrated orifice at the chamber outlet, provides an indication of the rate of liquid flow from the chamber. Control of supply of liquid is performed by a magnetically activated valve member.
    Type: Grant
    Filed: April 15, 1993
    Date of Patent: May 2, 1995
    Assignee: Fisher & Paykel Limited
    Inventor: Charles G. Murray
  • Patent number: 5367604
    Abstract: A humidifier provides humidified gases to a patient. The humidifier is very compact, having a gases volume of the order of 60 mls. A microporous water compartment is provided perpendicular to the gases flow to ensure efficient humidification of the gases. Also, a combined temperature probe and heater supply connector is provided which only supplies energy to the heater in the water compartment when the gases temperature sensor is appropriately positioned in the humidifier gases passageway. This reduces the risk of gases at excessively high temperatures being supplies to the patient.
    Type: Grant
    Filed: April 23, 1993
    Date of Patent: November 22, 1994
    Assignee: Fisher & Paykel Limited
    Inventor: Charles G. Murray
  • Patent number: 5062145
    Abstract: A humidifier of small gases passageway volume (of the order of 50 ml gases space) has a heater within a water containing envelope having a microporous wall common to the water space within the envelope and the gases space, the microporous wall being permeable to water vapour but not liquid water and the envelope being reinforced by a support which also directs the flow of gases over the surface of the envelope. The heater is wound as a flat spiral to avoid the effect of gases or water vapour bubbles on heater performance temperature.
    Type: Grant
    Filed: September 27, 1989
    Date of Patent: October 29, 1991
    Assignee: Fisher & Paykel Limited
    Inventors: Paul Zwaan, Ilija Orec, Charles G. Murray