Granted Patent
Utility
US 4,256,949 · App. 06/024,322
Method and wire for submerged arc welding of pipe
Inventors:
Stephen F. Baumann, Masahiro Nakabayashi, Gerald Daniel Uttrachi, Thomas L. Coless, Ernest N. Levine
Patented Case
View Patent ↗
Granted: Mar 17, 1981
Filed: Mar 27, 1979
Inventors
Stephen F. Baumann
Masahiro Nakabayashi
Gerald Daniel Uttrachi
Thomas L. Coless
Ernest N. Levine
Assignee (at issue)
Union Carbide Corporation
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.