Patents by Inventor David E. Curtin

David E. Curtin 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: 4304229
    Abstract: An underwater-breathing device which combines the use of a snorkel with a scuba regulator to allow a skin diver to readily switch back and forth from the regulator to the snorkel as he alternates from deep diving to surfacing with his head submerged just a few inches below water surface, the breathing device comprising a two-way-selection valve having a mouthpiece formed therewith, and the valve being adapted to receive and connect to a scuba regulator at one point thereof and to a snorkel tube at a second point, whereby the diver can selectively employ either the scuba regulator or the snorkel by positioning the valve core within the valve housing.
    Type: Grant
    Filed: April 18, 1980
    Date of Patent: December 8, 1981
    Inventor: David E. Curtin