Granted Patent
Utility
US 4,917,670 · App. 07/171,895
Continuous spinal anesthesia administering apparatus and method
Inventors:
Ronald J. Hurley, Kenneth W. Larson
Patented Case
View Patent ↗
Granted: Apr 17, 1990
Filed: Mar 22, 1988
Inventors
Ronald J. Hurley
Kenneth W. Larson
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.