Patents by Inventor Silvester Valayil

Silvester Valayil 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).

  • Solution for formation of black oxide
    Patent number: 4512818
    Abstract: There is disclosed a formulation for the formation of a black oxide particularly useful in the fabrication of multi-layered printed circuits. The formulation comprises an oxidant and a hydroxide and is characterized by the addition of a water soluble or dispersible polymer to regulate the properties of the black oxide solution.
    Type: Grant
    Filed: June 4, 1984
    Date of Patent: April 23, 1985
    Assignee: Shipley Company Inc.
    Inventors: Silvester Valayil, Magda Abu-Moustafa, Terry A. Benjamin