Granted Patent
Utility
US 4,556,813 · App. 06/631,222
Cast metal sonic transducer housing
Inventor:
Joseph Baumoel
Patented Case
View Patent ↗
Granted: Dec 3, 1985
Filed: Jul 16, 1984
Inventor
Joseph Baumoel
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.