Granted Patent
Utility
US 4,930,847 · App. 07/284,756
Multicolor holographic element and apparatus for head-up display applications
Inventor:
John N. Cederquist
Patented Case
View Patent ↗
Granted: Jun 5, 1990
Filed: Dec 12, 1988
Inventor
John N. Cederquist
Assignee (at issue)
Environmental Research Institute
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.