Patents by Inventor Harold J. Metcalf

Harold J. Metcalf 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: 4043332
    Abstract: A constant flow rate liquid medicament administering device which includes a container having a liquid medicament therein. The liquid medicament is fed under pressure to a constant output flow rate regulator that is operated by a drop in pressure between its inlet and outlet. The liquid leaving the regulator under reduced pressure and at a constant flow rate independent of entering pressure is led to a drip chamber in which any gas entrapped in the liquid is released so as to prevent introduction of gas into a patient. The drip rate in the chamber furnishes a rough visual indication of flow rate, the regulator being adjustable to secure any desired rate. Either before or after passage of the liquid through the drip chamber, the liquid is passed through a flow rate indicator which more accurately provides an instantaneous reading of flow rate. Finally, the liquid is led to an administering implement for introducing the liquid into a patient at a constant flow rate.
    Type: Grant
    Filed: May 14, 1975
    Date of Patent: August 23, 1977
    Assignees: Nathan Blumberg, Public Systems Research, Inc., Harold J. Metcalf
    Inventor: Harold J. Metcalf