Granted Patent
Utility
US 6,697,496 · App. 10/194,161
Electroacoustic transducer comprising a membrane with an improved pleats area
Inventor:
Ewald Frasl
Patented Case
View Patent ↗
Granted: Feb 24, 2004
Filed: Jul 11, 2002
Inventor
Ewald Frasl
Assignee (at issue)
KONINKLIJKE PHILIPS ELECTRONICS NV
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.