Granted Patent
Utility
US 4,742,576 · App. 06/815,073
Optical communication system employing coherent detection and method
Inventor:
Donald H. McMahon
Patented Case
View Patent ↗
Granted: May 3, 1988
Filed: Dec 23, 1985
Inventor
Donald H. McMahon
Assignee (at issue)
Polaroid Corporation
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.