Granted Patent
Utility
US 6,014,489 · App. 08/975,339
Light distributing tubes and methods of forming same
Inventor:
Walter A. Johanson
Patented Case
View Patent ↗
Granted: Jan 11, 2000
Filed: Nov 20, 1997
Inventor
Walter A. Johanson
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.