Granted Patent
Utility
US 4,895,423 · App. 07/293,074
Fabrication technique for low-loss fused taper directional couplers and pressure sensor produced thereby
Inventors:
Francois Bilodeau, Kenneth O. Hill, Sylvain Faucher, Derwyn C. Johnson
Patented Case
View Patent ↗
Granted: Jan 23, 1990
Filed: Jan 3, 1989
Inventors
Francois Bilodeau
Kenneth O. Hill
Sylvain Faucher
Derwyn C. Johnson
Assignee (at issue)
Canadian Patents and Development 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.