Patents by Inventor Robert J. Ludwig

Robert J. Ludwig 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).

  • Brightener additive and bath for alkaline cyanide-free zinc electroplating
    Patent number: 6830674
    Abstract: An aqueous alkaline non-cyanide zinc electroplating bath containing zinc ions for producing bright electrodeposits of zinc and a brightening agent comprising a polymeric quaternary amine and a reducing sugar, and a compound that forms a reducing sugar upon hydrolysis.
    Type: Grant
    Filed: November 5, 2002
    Date of Patent: December 14, 2004
    Assignee: Columbia Chemical Corporation
    Inventors: Robert J. Ludwig, William E. Rosenberg
  • Corrosion inhibiting composition for metals
    Publication number: 20040170848
    Abstract: A corrosion inhibiting composition for coating an article or substrate such as a metal, metal coating, chromated metal coating, and the like comprises a film-forming compound such as a wax or a polymer, and a sulfide salt or thio compound or a derivative of a thio compound.
    Type: Application
    Filed: February 28, 2003
    Publication date: September 2, 2004
    Applicant: COLUMBIA CHEMICAL CORPORATION
    Inventors: Robert J. Ludwig, Shane F. Lofland, William E. Rosenberg,
  • Brightener additive and bath for alkaline cyanide-free zinc electroplating
    Publication number: 20040084322
    Abstract: An aqueous alkaline non-cyanide zinc electroplating bath containing zinc ions for producing bright electrodeposits of zinc and a brightening agent comprising a polymeric quaternary amine and a reducing sugar, and a compound that forms a reducing sugar upon hydrolysis.
    Type: Application
    Filed: November 5, 2002
    Publication date: May 6, 2004
    Applicant: COLUMBIA CHEMICAL CORPORATION
    Inventors: Robert J. Ludwig, William E. Rosenberg