Granted Patent
Utility
US 6,654,473 · App. 09/851,907
Condenser microphone
Inventor:
James S. Collins
Patented Case
View Patent ↗
Granted: Nov 25, 2003
Filed: May 9, 2001
Inventor
James S. Collins
Assignee (at issue)
Knowles Electronics, LLC
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.