Granted Patent
Utility
US 4,895,419 · App. 07/308,662
Contact copying of reflection or volume holograms
Inventors:
James Doyle, Anthony I. Hopwood, Alan Adshead
Patented Case
View Patent ↗
Granted: Jan 23, 1990
Filed: Feb 10, 1989
Inventors
James Doyle
Anthony I. Hopwood
Alan Adshead
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.