Granted Patent
Utility
US 4,906,439 · App. 07/133,071
Biological diagnostic device and method of use
Inventor:
Gerd Grenner
Patented Case
View Patent ↗
Granted: Mar 6, 1990
Filed: Dec 21, 1987
Inventor
Gerd Grenner
Assignee (at issue)
PB Diagnostic Systems, 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.