Granted Patent
Utility
US 5,837,792 · App. 08/662,578
Polysiloxane light stabilizers
Inventors:
Roger Meuwly, Andreas Valet
Patented Case
View Patent ↗
Granted: Nov 17, 1998
Filed: Jun 13, 1996
Inventors
Roger Meuwly
Andreas Valet
Assignee (at issue)
Ciba Specialty Chemicals Corporation
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.