Granted Patent
Utility
US 4,837,534 · App. 07/150,251
Ceramic block filter with bidirectional tuning
Inventor:
Mark I. Van Horn
Patented Case
View Patent ↗
Granted: Jun 6, 1989
Filed: Jan 29, 1988
Inventor
Mark I. Van Horn
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.