Patents by Inventor Charles Kaarstad

Charles Kaarstad 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).

  • Device for lowering and raising a fish rearing unit
    Patent number: 5845602
    Abstract: A float collar, comprising inner and outer float rings mounts the fish rearing unit for selective raising and lowering utilizing valve controlled air and water inlets and outlets leading to internal chambers within the float rings arranged symmetrically relative to a diametric axis of the float collar.
    Type: Grant
    Filed: October 14, 1997
    Date of Patent: December 8, 1998
    Inventors: Charles Kaarstad, Harald Volden
  • Device for use in a rearing unit
    Patent number: 5549076
    Abstract: A rearing unit for use in a body of water includes a frame, a net bag held by the frame, a jumping fence mounted peripherally around the frame, a top net attached to the jumping fence to form, with the net bag, a closed unit, a floating ring supporting the closed unit and means for raising and lowering the closed unit with respect to the floating ring.
    Type: Grant
    Filed: October 18, 1994
    Date of Patent: August 27, 1996
    Inventor: Charles Kaarstad