Granted Patent
Utility
US 4,420,826 · App. 06/280,637
Stress relief for flextensional transducer
Inventors:
William J. Marshall, Ronald P. White
Patented Case
View Patent ↗
Granted: Dec 13, 1983
Filed: Jul 6, 1981
Inventors
William J. Marshall
Ronald P. White
Assignee (at issue)
Sanders 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.