Granted Patent
Utility
US 4,900,683 · App. 07/089,858
Process for preparation of samples for analysis
Inventors:
Andre Metzger, Peter Grimm, Andre J. Nohl, Vance J. Nau
Patented Case
View Patent ↗
Granted: Feb 13, 1990
Filed: Oct 14, 1987
Inventors
Andre Metzger
Peter Grimm
Andre J. Nohl
Vance J. Nau
Assignee (at issue)
Ciba-Geigy
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.