Granted Patent
Utility
US 5,481,869 · App. 08/261,365
Two stage pressurization system for aerospace applications
Inventor:
Donald A. Pahl
Patented Case
View Patent ↗
Granted: Jan 9, 1996
Filed: Jun 16, 1994
Inventor
Donald A. Pahl
Assignee (at issue)
Olin Corporation
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.