Granted Patent
Utility
US 4,343,827 · App. 06/223,528
Method of fine-tuning a monolithic crystal filter
Inventor:
Edwin C. Thompson
Patented Case
View Patent ↗
Granted: Aug 10, 1982
Filed: Jan 8, 1981
Inventor
Edwin C. Thompson
Assignee (at issue)
Western Electric Company, 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.