Granted Patent
Utility
US 4,202,215 · App. 05/954,767
Sonic pulse-echo method and apparatus for determining attenuation coefficients
Inventor:
Charles Meyer
Patented Case
View Patent ↗
Granted: May 13, 1980
Filed: Oct 26, 1978
Inventor
Charles Meyer
Assignee (at issue)
Kurt Orban Company, 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.