Granted Patent
Utility
US 4,915,464 · App. 07/233,400
Reflection holograms and the replication thereof
Inventor:
Antony I. Hopwood
Patented Case
View Patent ↗
Granted: Apr 10, 1990
Filed: Aug 18, 1988
Inventor
Antony I. Hopwood
Assignee (at issue)
Ciba-Geigy
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.