Granted Patent
Utility
US 4,550,593 · App. 06/399,403
Turbomolecular pump suitable for performing counterflow leakage tests
Inventor:
Gunter Reich
Patented Case
View Patent ↗
Granted: Nov 5, 1985
Filed: Jul 19, 1982
Inventor
Gunter Reich
Assignee (at issue)
Leybold-Heraeus GmbH
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.