Granted Patent
Utility
US 4,874,213 · App. 07/204,379
Method of forming volume phase reflection holograms
Inventor:
James J. Cowan
Patented Case
View Patent ↗
Granted: Oct 17, 1989
Filed: Jun 9, 1988
Inventor
James J. Cowan
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.