Patents by Inventor Sylviane Wajda

Sylviane Wajda 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).

  • Zinc coated steel plates coated with a pre-lubricating hydroxysulphate layer and methods for obtaining same
    Patent number: 6528182
    Abstract: The invention concerns a steel plate coated with a metal layer based on zinc and a zinc hydroxysulphate layer, whereof the surface density of sulphur is more than 0.5 mg/m2. The invention also concerns a method for obtaining said plate by treating a zinc coated sheet metal: either in a highly alkaline sulphate solution under polarization; or in a sulphate solution containing Zn2+ ions without polarization. The hydroxysulphate deposit brings about a pre-lubricating effect applicable to operations for forming sheet metal.
    Type: Grant
    Filed: June 25, 2001
    Date of Patent: March 4, 2003
    Assignee: Sollac
    Inventors: Alain Bello, Sylviane Wajda, Jacques Petitjean, Armand Rossi