Granted Patent
Utility
US 4,715,028 · App. 06/874,118
Optical communication system
Inventors:
Donald H. McMahon, Gilbert L. Johnson
Patented Case
View Patent ↗
Granted: Dec 22, 1987
Filed: Jun 13, 1986
Inventors
Donald H. McMahon
Gilbert L. Johnson
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.