Granted Patent
Utility
US 4,823,622 · App. 06/942,201
Sample metering valve for a sample preparation system
Inventors:
Andre J. Nohl, Vance J. Nau, Andre Metzger
Patented Case
View Patent ↗
Granted: Apr 25, 1989
Filed: Dec 16, 1986
Inventors
Andre J. Nohl
Vance J. Nau
Andre Metzger
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.