Granted Patent
Utility
US 4,765,056 · App. 06/847,999
Method of manufacture of helical waveguide structure for traveling wave tubes
Inventors:
Robert Harper, Joseph L. Rousseau
Patented Case
View Patent ↗
Granted: Aug 23, 1988
Filed: Apr 3, 1986
Inventors
Robert Harper
Joseph L. Rousseau
Assignee (at issue)
Raytheon Company
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.