Patents by Inventor Martino Ravizza

Martino Ravizza 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).

  • Fixing unit for electrostatic copiers
    Patent number: 4009953
    Abstract: A fixing unit for fixing the developing powder on a copy sheet produced in a copy machine which comprises a first roller having its outer surface covered by a layer adapted to resist adhesion of the powder thereto, a second roller cooperating with the first and defining with said first roller a nip through which the copy sheet is passed by rotation of the rollers, with the face bearing the powder in contact with the surface of the first roller, and a third roller rotated in contact with the first roller carrying in its interior a plurality of selectively actuable heating units for selectively heating portions of the surface of the first roller, in accordance with the length of a copy sheet.
    Type: Grant
    Filed: October 14, 1975
    Date of Patent: March 1, 1977
    Assignee: Ing. C. Olivetti & C., S.p.A.
    Inventors: Martino Ravizza, Giancarlo Abate-Daga