Patents by Inventor Francesco Longhetto

Francesco Longhetto 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).

  • Depthometer for underwater immersion
    Patent number: 4052899
    Abstract: A depthometer having an outer waterproof casing provided with a transparent wall through which a graduated dial is visible, an indicator element movable along said dial, and an actuating element for said indicator, this actuating element being responsive to external pressure and consisting in an elastically deformable end wall of a cup-shaped member forming part of said outer casing, and a lateral wall of said cup-shaped member being stiffened to be indeformable with said end wall.BACKGROUND OF THE INVENTIONThis invention relates to a depthometer for underwater immersion.
    Type: Grant
    Filed: March 31, 1976
    Date of Patent: October 11, 1977
    Assignee: Semperit Anstalt
    Inventor: Francesco Longhetto
  • Pressure gauge
    Patent number: 4050314
    Abstract: A pressure gauge having a cup-shaped case closed by a transparent cover, through which a graduated scale and a pointer movable therealong are visible, the cover being mounted rotatably on the case in an axial fixed position with respect thereto.
    Type: Grant
    Filed: March 31, 1976
    Date of Patent: September 27, 1977
    Assignee: Semperit Anstalt
    Inventor: Francesco Longhetto