Granted Patent
Utility
US 5,605,156 · App. 08/442,033
Flexible diaphragm tonometer
Inventors:
Gary M. Drzewiecki, Robert D. Butterfield
Patented Case
View Patent ↗
Granted: Feb 25, 1997
Filed: May 16, 1995
Inventors
Gary M. Drzewiecki
Robert D. Butterfield
Assignee (at issue)
Rutgers University
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.