Granted Patent
Utility
US 4,646,752 · App. 06/488,378
Adjustable intracranial pressure measuring screw
Inventors:
Karl W. Swann, Eric R. Cosman
Patented Case
View Patent ↗
Granted: Mar 3, 1987
Filed: Apr 25, 1983
Inventors
Karl W. Swann
Eric R. Cosman
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.