Granted Patent
Utility
US 4,989,071 · App. 07/327,995
Method of preparing a hologram using readily available light sources
Inventor:
Anthony I. Hopwood
Patented Case
View Patent ↗
Granted: Jan 29, 1991
Filed: Mar 23, 1989
Inventor
Anthony I. Hopwood
Assignee (at issue)
Ilford AG
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.