Granted Patent
Utility
US 4,791,388 · App. 07/043,190
Channel waveguide modulator
Inventors:
Norman A. Sanford, Amaresh Mahapatra
Patented Case
View Patent ↗
Granted: Dec 13, 1988
Filed: Apr 27, 1987
Inventors
Norman A. Sanford
Amaresh Mahapatra
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.