Granted Patent
Utility
US 4,444,250 · App. 06/449,375
Flow diverter
Inventors:
Julian D. Keithahn, Charles D. Morrill, Joseph R. Roche
Patented Case
View Patent ↗
Granted: Apr 24, 1984
Filed: Dec 13, 1982
Inventors
Julian D. Keithahn
Charles D. Morrill
Joseph R. Roche
Assignee (at issue)
Hydril Company
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.