Granted Patent
Utility
US 4,994,022 · App. 07/305,901
Blood conservation system
Inventors:
Michael W. Steffler, Steven J. Carusillo
Patented Case
View Patent ↗
Granted: Feb 19, 1991
Filed: Feb 2, 1989
Inventors
Michael W. Steffler
Steven J. Carusillo
Assignee (at issue)
STRYKER CORPORATION
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.