Granted Patent
Utility
US 4,637,402 · App. 06/556,894
Method for quantitatively measuring a hearing defect
Inventor:
Roger A. Adelman
Patented Case
View Patent ↗
Granted: Jan 20, 1987
Filed: Dec 1, 1983
Inventor
Roger A. Adelman
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.