Granted Patent
Utility
US 4,423,394 · App. 05/803,903
Multiple pole bandpass filter having monolithic crystal elements
Inventor:
Robert G. Kinsman
Patented Case
View Patent ↗
Granted: Dec 27, 1983
Filed: Jun 6, 1977
Inventor
Robert G. Kinsman
Assignee (at issue)
Motorola, 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.