Granted Patent
Utility
US 4,618,638 · App. 06/674,216
Compositions containing alpha-cyanocinnamate ultraviolet-absorbing stabilizers substituted by an aliphatic hydroxyl group
Inventors:
Martin Dexter, Roland A. E. Winter
Patented Case
View Patent ↗
Granted: Oct 21, 1986
Filed: Nov 23, 1984
Inventors
Martin Dexter
Roland A. E. Winter
Assignee (at issue)
Ciba-Geigy
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.