Granted Patent
Utility
US 5,701,665 · App. 08/005,701
Pi signal frequency filter method of manufacture
Inventor:
John P. Kling
Patented Case
View Patent ↗
Granted: Dec 30, 1997
Filed: Jan 19, 1993
Inventor
John P. Kling
Assignee (at issue)
Whitaker & Company
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.