Granted Patent
Utility
US 4,428,715 · App. 06/324,718
Multi-stage centrifugal compressor
Inventor:
Jesse Wiggins
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Nov 24, 1981
Inventor
Jesse Wiggins
Assignee (at issue)
Caterpillar Tractor 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.