Granted Patent
Utility
US 4,444,401 · App. 06/449,377
Flow diverter seal with respective oblong and circular openings
Inventors:
Joseph R. Roche, William L. Clark
Patented Case
View Patent ↗
Granted: Apr 24, 1984
Filed: Dec 13, 1982
Inventors
Joseph R. Roche
William L. Clark
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.