Granted Patent
Utility
US 4,913,447 · App. 07/326,281
Dynamic seal for rotor apparatus
Inventor:
Hans Jostlein
Patented Case
View Patent ↗
Granted: Apr 3, 1990
Filed: Mar 21, 1989
Inventor
Hans Jostlein
Assignee (at issue)
Universities Research Association, Inc.
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.