Patents by Inventor Francesco Calza

Francesco Calza 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).

  • Collapsible dam and apparatus for raising and lowering the dam
    Patent number: 4310262
    Abstract: A collapsible dam comprising a flexible substantially rectangular substantially water repellant web stretched across the width of a waterway with one edge fixed to the bottom of the waterway and the opposite edge supported by a rigid rod adjacent to the water surface. The rigid rod is hinged with respect to the bottom of the waterway and connected at one end to a pressure actuated piston-cylinder assembly which moves the opposite end of the rod and attached web upwardly while the fixed edge remains submerged against the bottom of the waterway.
    Type: Grant
    Filed: March 31, 1980
    Date of Patent: January 12, 1982
    Assignee: Pirelli/Furlanis Applicazioni
    Inventors: Francesco Calza, Bruno Borca
  • Liftable and collapsible barrage
    Patent number: 4229119
    Abstract: An artificial dam or barrage which is adapted to be moved vertically from e bottom of the waterway in which it is installed is provided with a sheet of flexible material fixed to the bottom of the waterway and suspended with flexible cables above the bottom of the waterway.
    Type: Grant
    Filed: April 17, 1978
    Date of Patent: October 21, 1980
    Assignee: Pirelli Furlanis--Applicazioni Idrauliche Agricole Gomma S.p.A.
    Inventors: Bruno Borca, Francesco Calza