Granted Patent
Utility
US 4,904,052 · App. 07/300,386
Polarization preserving optical fiber and method of manufacturing
Inventors:
Stephen C. Rand, Joseph A. Wysocki
Patented Case
View Patent ↗
Granted: Feb 27, 1990
Filed: Jan 23, 1989
Inventors
Stephen C. Rand
Joseph A. Wysocki
Assignee (at issue)
Hughes Aircraft 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.