Granted Patent
Utility
US 4,388,928 · App. 06/190,221
Signal processing means particularly for heart pacemakers
Inventors:
Christer Ekwall, Hakan Elmqvist
Patented Case
View Patent ↗
Granted: Jun 21, 1983
Filed: Sep 24, 1980
Inventors
Christer Ekwall
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.