Patents by Inventor Charles K. Vrana

Charles K. Vrana 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: 4598905
    Abstract: An attachable safety steadying structure for the conventional trampoline comprising sturdy upright members spaced apart on the trampoline, joined at the top by a horizontal bar member, designed for the elderly and infirm to hold-on to while exercising, which safety structure can also be purchased separately for those who already have the naked trampoline.
    Type: Grant
    Filed: December 20, 1984
    Date of Patent: July 8, 1986
    Inventor: Charles K. Vrana
  • Patent number: 4421199
    Abstract: A broad sheet hearing aid of the sound reflecting type having an endless expansion type holding strap inserted in the wings of the device and to also fit over the forehead to hold the device in place.
    Type: Grant
    Filed: March 4, 1982
    Date of Patent: December 20, 1983
    Inventor: Charles K. Vrana
  • Patent number: 4117992
    Abstract: A vertical lift device comprised of a generally vertically disposed cylindrical tunnel, open at the top and bottom ends, with a driven propeller axially mounted at the open top end to direct a stream of air downwardly through the tunnel. A first portion of the stream of air is spirally directed outwardly through a peripheral portion of the open bottom end to create first lift forces for the device by using jet stream action. A second portion of the air stream is directed downwardly through a central axially disposed tube in the cylindrical tunnel to twin fans which redirect the second portion upwardly into a truncated cone, surrounding the central tube, to increase the pressure against the inner wall surface of the cone to create second lift forces.
    Type: Grant
    Filed: October 28, 1976
    Date of Patent: October 3, 1978
    Inventor: Charles K. Vrana
  • Patent number: 4002137
    Abstract: A recreational water scooter craft to travel on the surface of the water comprising a pair of parallel, spaced apart elongated float members, a deck connecting between the floats, a compound scissors linkage connected between an operating lever and a flap oar to amplify the distance of travel of the flap oar and the resulting speed of the craft when the operating lever is actuated by a person positioned in a seat area of the craft, and a foot actuated lever is provided to actuate a rudder for steering purposes.
    Type: Grant
    Filed: September 15, 1975
    Date of Patent: January 11, 1977
    Inventor: Charles K. Vrana
  • Patent number: 3970031
    Abstract: This invention pertains to a floating oar device which includes a pair of floatation pads attached to a handle; each floatation pad provides a flap hinged thereto which close during each rearward power stroke and open during the retrieve phase of each stroke. The floating oar device may take any one of several forms which permit it to be used in a generally normal swimming attitude by a person in the water or in prone, sitting or standing attitudes on a float board.
    Type: Grant
    Filed: April 7, 1975
    Date of Patent: July 20, 1976
    Inventor: Charles K. Vrana