Patents by Inventor Carlo Lavezzari

Carlo Lavezzari 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).

  • Protection process of flat rolled steel sections by means of multi-layer electrolytic plating in particularly aggressive environments
    Patent number: 4548872
    Abstract: An improved process for the protection of flat rolled steel sections in the form of bands, plates or sheets in particularly aggressive environments is disclosed. According to applicant's copending U.S. patent application Ser. No. 585,856, filed Mar. 2, 1984, U.S. Pat. No. 4,520,077, steel plates previously plated with zinc or zinc alloys are, as such, plated with layers of an electrolytic plating consisting of inorganic elements or compounds, preferably chromium metal and chromium oxide. The improvement according to this invention comprises a chemical passivation in a chrome anhydride solution of the zinc base plating layer, prior to carrying out the successive multi-layer electrolytic plating of inorganic elements or compounds.
    Type: Grant
    Filed: July 24, 1984
    Date of Patent: October 22, 1985
    Assignee: Zincroksid S.p.A.
    Inventor: Carlo Lavezzari
  • Process for the protection of galvanized steel rolled sections with a two layer chromium-chromate coating
    Patent number: 4520077
    Abstract: A process is disclosed for the protection of steel rolled sections, in form of rolls, sheets or plates, already plated with zinc or zinc containing alloys, by means of one or more layers of an electrolytic plating, consisting of inorganic elements or compounds, preferably metal chrome and chrome oxide.
    Type: Grant
    Filed: March 2, 1984
    Date of Patent: May 28, 1985
    Assignee: Zincroksid S.p.A.
    Inventor: Carlo Lavezzari