Granted Patent
Utility
US 4,995,263 · App. 07/450,857
Tuning fork quartz manometer
Inventor:
Rudolf Stocker
Patented Case
View Patent ↗
Granted: Feb 26, 1991
Filed: Dec 14, 1989
Inventor
Rudolf Stocker
Assignee (at issue)
Balzers Aktiengesellschaft
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.