Granted Patent
Utility
US 4,972,438 · App. 07/391,078
Self-oscillating transmitter
Inventor:
Sergiu Silvian
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: Aug 8, 1989
Inventor
Sergiu Silvian
Assignee (at issue)
Siemens Pacesetter, Inc.
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.