Granted Patent
Utility
US 4,970,522 · App. 07/392,289
Waveguide apparatus
Inventor:
Murray Jerel Niman
Patented Case
View Patent ↗
Granted: Nov 13, 1990
Filed: Aug 11, 1989
Inventor
Murray Jerel Niman
Assignee (at issue)
Marconi Electronic Devices Limited
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.