Granted Patent
Utility
US 4,922,406 · App. 07/208,864
Labyrinth seal in disk storage drive
Inventor:
Bernhard Schuh
Patented Case
View Patent ↗
Granted: May 1, 1990
Filed: Jun 15, 1988
Inventor
Bernhard Schuh
Assignee (at issue)
Papst Motoren GmbH & Co KG
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.