Granted Patent
Utility
US 4,660,975 · App. 06/630,605
Controlling light beam spectrum
Inventor:
John E. Aughton
Patented Case
View Patent ↗
Granted: Apr 28, 1987
Filed: Jul 13, 1984
Inventor
John E. Aughton
Assignee (at issue)
Crosfield Electronics Limited
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.