Patents by Inventor Robertus Exalto

Robertus Exalto 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).

  • Pickling of aluminum
    Patent number: 4397721
    Abstract: Articles of aluminum are pickled by placing them as anodes into a sulfuric acid bath in the absence of chromic acid or bichromate and connecting them by a short-circuit connection to a carbon cathode placed in the same bath. The process also excludes the application of an anodic control voltage.
    Type: Grant
    Filed: February 11, 1982
    Date of Patent: August 9, 1983
    Assignee: Fokker B.V.
    Inventors: Robertus Exalto, Adriaan Kwakernaak
  • Pickling of aluminum
    Patent number: 4394232
    Abstract: Articles of aluminum are pickled by immersing them into a sulfuric acid bath containing no chromic acid or bichromate but having carbon particles suspended therein. The carbon particles will form tiny electric cells with the aluminum articles at their places of contact and will initiate electrochemical dissolution phenomena there at the point of contact.
    Type: Grant
    Filed: February 11, 1982
    Date of Patent: July 19, 1983
    Assignee: Fokker B.V.
    Inventors: Robertus Exalto, Adriaan Kwakernaak