Granted Patent
Utility
US 4,321,928 · App. 06/188,518
Heart pacemaker
Inventor:
Hakan Elmqvist
Patented Case
View Patent ↗
Granted: Mar 30, 1982
Filed: Sep 18, 1980
Inventor
Hakan Elmqvist
Assignee (at issue)
Siemens Aktiengesellschaft
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.