Granted Patent
Utility
US 5,111,164 · App. 07/422,020
Matching asymmetrical discontinuities in a waveguide twist
Inventor:
Frans C. de Ronde
Patented Case
View Patent ↗
Granted: May 5, 1992
Filed: Oct 16, 1989
Inventor
Frans C. de Ronde
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.