Granted Patent
Utility
US 4,423,890 · App. 06/213,701
Welded tube to wall junction
Inventors:
Charles D. Hackett, James R. Bray
Patented Case
View Patent ↗
Granted: Jan 3, 1984
Filed: Dec 8, 1980
Inventors
Charles D. Hackett
James R. Bray
Assignee (at issue)
Combustion Engineering, Inc.
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.