Granted Patent
Utility
US 5,727,077 · App. 08/772,189
Electroacoustic transducer comprising a closing member
Inventor:
Ewald Frasl
Patented Case
View Patent ↗
Granted: Mar 10, 1998
Filed: Dec 20, 1996
Inventor
Ewald Frasl
Assignee (at issue)
U.S. Philips Corporation
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.