Granted Patent
Utility
US 4,661,675 · App. 06/768,656
Welding sealants for metals and method of use
Inventors:
James L. Guthrie, Helen F. Roberts, Christian B. Lundsager
Patented Case
View Patent ↗
Granted: Apr 28, 1987
Filed: Aug 23, 1985
Inventors
James L. Guthrie
Helen F. Roberts
Christian B. Lundsager
Assignee (at issue)
W. R. Grace & Co.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.