Granted Patent
Utility
US 5,408,439 · App. 07/985,866
Monolithic construction of waveguide tubes
Inventor:
John Urmson
Patented Case
View Patent ↗
Granted: Apr 18, 1995
Filed: Dec 4, 1992
Inventor
John Urmson
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.