Granted Patent
Utility
US 5,446,578 · App. 07/327,945
Polarization preserving optical isolator
Inventors:
Kok-Wai Chang, Wayne V. Sorin
Patented Case
View Patent ↗
Granted: Aug 29, 1995
Filed: Mar 23, 1989
Inventors
Kok-Wai Chang
Wayne V. Sorin
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.