Granted Patent
Utility
US 5,084,224 · App. 07/602,597
Method for making hearing aid vent passage
Inventor:
Velma Watters
Patented Case
View Patent ↗
Granted: Jan 28, 1992
Filed: Oct 24, 1990
Inventor
Velma Watters
Assignee (at issue)
Unitron Industries Ltd.
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.