Granted Patent
Utility
US 5,740,258 · App. 08/461,001
Active noise supressors and methods for use in the ear canal
Inventor:
Scott H. Goodwin-Johansson
Patented Case
View Patent ↗
Granted: Apr 14, 1998
Filed: Jun 5, 1995
Inventor
Scott H. Goodwin-Johansson
Assignee (at issue)
MCNC
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.