Patents by Inventor Helen F. Roberts

Helen F. Roberts 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).

  • Welding sealants for metals and method of use
    Patent number: 4661675
    Abstract: A weldable sealant composition is made by adding ferrous metal particles to a sealant having a viscosity of at least 6 million centipoises. The sealant composition is placed between two metal plates and permits resistance welding, i.e. spot welding, to take place.
    Type: Grant
    Filed: August 23, 1985
    Date of Patent: April 28, 1987
    Assignee: W. R. Grace & Co.
    Inventors: James L. Guthrie, Helen F. Roberts, Christian B. Lundsager
  • Weldable sealants for metal and method of use
    Patent number: 4559373
    Abstract: A weldable sealant composition is made by adding ferrous metal particles to a sealant having a viscosity of at least 6 million centipoises. The sealant composition is placed between two metal plates and permits resistance welding, i.e. spot welding, to take place.
    Type: Grant
    Filed: July 18, 1983
    Date of Patent: December 17, 1985
    Assignee: W. R. Grace & Co.
    Inventors: James L. Guthrie, Helen F. Roberts, Christian B. Lundsager