Granted Patent
Utility
US 4,904,864 · App. 07/131,166
Multi-wavelength time domain reflectometer
Inventors:
John P. Dakin, David Pratt
Patented Case
View Patent ↗
Granted: Feb 27, 1990
Filed: Dec 10, 1987
Inventors
John P. Dakin
David Pratt
Assignee (at issue)
Plessey Overseas 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.