Granted Patent
Utility
US 6,291,561 · App. 09/403,827
Photochromic compositions, photochromic compounds (co)polymer matrices
Inventors:
Olivier Breyne, You-Ping Chan, David Henry, Xavier Lafosse
Patented Case
View Patent ↗
Granted: Sep 18, 2001
Filed: Feb 14, 2000
Inventors
Olivier Breyne
You-Ping Chan
David Henry
Xavier Lafosse
Assignee (at issue)
Corning SAS
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.