Granted Patent
Utility
US 4,928,674 · App. 07/273,810
Cardiopulmonary resuscitation and assisted circulation system
Inventors:
Henry R. Halperin, Joshua E. Tsitlik, Myron Weisfeldt, Mark Gelfand
Patented Case
View Patent ↗
Granted: May 29, 1990
Filed: Nov 21, 1988
Inventors
Henry R. Halperin
Joshua E. Tsitlik
Myron Weisfeldt
Mark Gelfand
Assignee (at issue)
The Johns Hopkins University
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.