Granted Patent
Utility
US 4,767,277 · App. 06/255,151
Fiber-filled polymer impeller
Inventor:
Fredric W. Buse
Patented Case
View Patent ↗
Granted: Aug 30, 1988
Filed: Apr 17, 1981
Inventor
Fredric W. Buse
Assignee (at issue)
Ingersoll-Rand 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.