Granted Patent
Utility
US 4,779,945 · App. 06/888,696
Directional coupler utilizing biconically tapered optical fibers and a method of making same
Inventors:
Kenneth O. Hill, Derwyn C. Johnson
Patented Case
View Patent ↗
Granted: Oct 25, 1988
Filed: Jul 24, 1986
Inventors
Kenneth O. Hill
Derwyn C. Johnson
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.