Granted Patent
Utility
US 6,022,909 · App. 08/951,187
Photochromic ink
Inventors:
Michael B. Meinhardt, Randall R. Bridgeman
Patented Case
View Patent ↗
Granted: Feb 8, 2000
Filed: Oct 15, 1997
Inventors
Michael B. Meinhardt
Randall R. Bridgeman
Assignee (at issue)
Tektronix, Inc.
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.