Granted Patent
Utility
US 4,821,245 · App. 07/104,343
Electromagnetic transducer
Inventor:
Ing. R. Riedlinger
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Oct 2, 1987
Inventor
Ing. R. Riedlinger
Assignee (at issue)
RICHARD WOLF GMBH
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.