Granted Patent
Utility
US 4,639,093 · App. 06/585,817
Switchable bandwidth filter
Inventor:
Frederick Kubick
Patented Case
View Patent ↗
Granted: Jan 27, 1987
Filed: Mar 2, 1984
Inventor
Frederick Kubick
Assignee (at issue)
UNITED TECHNOLOGIES CORPORATION
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.