Granted Patent
Utility
US 5,693,422 · App. 08/491,242
Silica-free UV-absorbing abrasion resistant coatings
Inventors:
John D. Basil, Chia-Cheng Lin, Robert M. Hunia
Patented Case
View Patent ↗
Granted: Dec 2, 1997
Filed: Jun 16, 1995
Inventors
John D. Basil
Chia-Cheng Lin
Robert M. Hunia
Assignee (at issue)
PPG Industries, 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.