Granted Patent
Utility
US 4,925,263 · App. 07/273,058
Proton-exchanged waveguides for sum-frequency generation
Inventors:
Norman A. Sanford, James M. Connors
Patented Case
View Patent ↗
Granted: May 15, 1990
Filed: Nov 17, 1988
Inventors
Norman A. Sanford
James M. Connors
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.