Granted Patent
Utility
US 5,198,912 · App. 07/729,777
Volume phase hologram with liquid crystal in microvoids between fringes
Inventors:
Richard T. Ingwall, Mark A. Troll, Duncan H. Whitney
Patented Case
View Patent ↗
Granted: Mar 30, 1993
Filed: Jul 10, 1991
Inventors
Richard T. Ingwall
Mark A. Troll
Duncan H. Whitney
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.