Granted Patent
Utility
US 6,151,398 · App. 09/006,134
Magnetic film ultrasonic emitter
Inventor:
Elwood G. Norris
Patented Case
View Patent ↗
Granted: Nov 21, 2000
Filed: Jan 13, 1998
Inventor
Elwood G. Norris
Assignee (at issue)
American Technology Corporation
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.