Granted Patent
Utility
US 4,995,787 · App. 07/408,744
Axial flow impeller
Inventor:
John O'Connor
Patented Case
View Patent ↗
Granted: Feb 26, 1991
Filed: Sep 18, 1989
Inventor
John O'Connor
Assignee (at issue)
Torrington Research 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.