Granted Patent
Utility
US 6,501,346 · App. 09/658,669
Ceramic filter for use with a beacon receiver
Inventor:
Doug Spurell
Patented Case
View Patent ↗
Granted: Dec 31, 2002
Filed: Sep 8, 2000
Inventor
Doug Spurell
Assignee (at issue)
Communications Systems International, Inc.
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.