Granted Patent
Utility
US 5,010,921 · App. 07/380,827
Nonsymmetrical valve
Inventor:
Andre J. Nohl
Patented Case
View Patent ↗
Granted: Apr 30, 1991
Filed: Jul 17, 1989
Inventor
Andre J. Nohl
Assignee (at issue)
Spectra-Physics, 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.