Granted Patent
Utility
US 6,166,129 · App. 09/410,524
Photochromic polyurethanes
Inventors:
James W. Rosthauser, Karl W. Haider, Sivaram Krishnan, James N. Rieck
Patented Case
View Patent ↗
Granted: Dec 26, 2000
Filed: Oct 1, 1999
Inventors
James W. Rosthauser
Karl W. Haider
Sivaram Krishnan
James N. Rieck
Assignee (at issue)
Bayer Aktiengesellschaft
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.