Patents by Inventor Allan M. Hammerton-Fraser

Allan M. Hammerton-Fraser 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: 4316458
    Abstract: The present invention relates to a delivery tube array which is used to connect a patient to a patient ventilator. A problem arising in such use of patient ventilators is that exhaled air cannot be exhausted directly to the atmosphere since a normal outlet valve would also serve to exhaust air delivered on the compression stroke of the ventilator. The invention overcomes this problem by the introduction into a delivery tube array of a relief valve, a non-return valve 12 and a bleed-pipe which connects the relief valve to a point up-stream of the non-return valve. Such an arrangement ensures that the relief valve opens only when the pressure within the patient's lungs is greater than the pressure upstream of the non-return valve.
    Type: Grant
    Filed: May 8, 1979
    Date of Patent: February 23, 1982
    Assignee: National Research Development Corporation
    Inventor: Allan M. Hammerton-Fraser