Granted Patent
Utility
US 5,227,623 · App. 07/829,994
Method and apparatus for measuring polarization mode dispersion in optical devices
Inventor:
Brian L. Heffner
Patented Case
View Patent ↗
Granted: Jul 13, 1993
Filed: Jan 31, 1992
Inventor
Brian L. Heffner
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.