Patents by Inventor Pier C. Martinengo

Pier C. Martinengo 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).

  • Process for sintering silicon nitride compacts
    Patent number: 4354990
    Abstract: Sintered silicon nitride articles are prepared by sintering a silicon nitride compact of a density of at least 1.3 g/cm.sup.3 in nitrogen gas atmosphere at substantially atmospheric pressure, while the compact is embedded in a protective powder comprising silicon nitride, boron nitride, or a mixture of silicon nitride and boron nitride, and one or more sinterization additives for silicon nitride, said additives being present in the protective powder in an amount of from 3 to 20% by weight.
    Type: Grant
    Filed: August 25, 1980
    Date of Patent: October 19, 1982
    Assignee: Fiat Societa per Azioni
    Inventors: Pier C. Martinengo, Angelo Giachello, Giuseppe Tommasini, Paul Popper
  • Process for producing protective coatings on metals and metal alloys for use at high temperatures
    Patent number: 4241113
    Abstract: A process for forming a protective metal diffusion coating on a metal or metal alloy workpiece including internal cavity surfaces, comprises coating the workpiece with a slurry in acetone and cellulose acetate of a powder of average grain size of 0.5.mu. to 10.mu., including aluminum and possibly chromium and/or a small quantity of cerium or yttrium hydride and heating the workpiece in a non-oxidizing environment to dissociate the hydride and effect diffusion of the metals into the surface of the workpiece.
    Type: Grant
    Filed: September 6, 1979
    Date of Patent: December 23, 1980
    Assignee: Fiat Societa per Azioni
    Inventors: Pier C. Martinengo, Carlo Carughi