Granted Patent
Utility
US 6,231,509 · App. 09/206,203
Apparatus and method for monitoring intracranial pressure
Inventors:
Royce Johnson, William H. Quirk, IV
Patented Case
View Patent ↗
Granted: May 15, 2001
Filed: Dec 5, 1998
Inventors
Royce Johnson
William H. Quirk, IV
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.