Patents Represented by Attorney Stanley Lieberstein

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  • Non-precious metal colloidal dispersions for electroless metal deposition
    Patent number: 4136216
    Abstract: Metallic surfaces are imparted to non-conductive or dielectric substrates by an electroless coating process comprising coating the surface of the substrate with a hydrous oxide colloid of non-precious metal ions preferably selected from the group consisting of cobalt, nickel and copper ions, reducing the selected metal ions to a reduced or zero valence state with a suitable reducing agent, and exposing the substrate to an electroless plating bath.
    Type: Grant
    Filed: October 12, 1976
    Date of Patent: January 23, 1979
    Assignee: Surface Technology, Inc.
    Inventor: Nathan Feldstein
  • Method of applying dispersions for activating non-conductors for electroless plating and article
    Patent number: 4132832
    Abstract: Metallic surfaces are imparted to non-conductive or dielectric substrates by an electroless (chemical) coating process comprised of coating the surface of the substrate with colloids of catalytic non-precious metals wherein the metals are either part of an alloy or in the elemental state or a compound and wherein the colloidal compositions are prepared by a special method which renders the colloids a greater catalytic activity when used in the plating process.
    Type: Grant
    Filed: November 25, 1977
    Date of Patent: January 2, 1979
    Inventor: Nathan Feldstein
  • Method of preparation and use of electroless plating catalysts
    Patent number: 4131699
    Abstract: A method for the formation of novel colloidal catalytic electroless plating compositions comprises admixing a highly stable non active (weakly active) colloidal dispersion with a reactivity modifier. The admixture so formed is used in electroless plating processes wherein a substrate is contacted with the novel colloidal catalytic composition, rinsed, contacted with a reducing or activating solution (which may be optional) and then contacted with an electroless plating solution.
    Type: Grant
    Filed: August 1, 1977
    Date of Patent: December 26, 1978
    Inventor: Nathan Feldstein