Granted Patent
Utility
US 5,084,499 · App. 07/521,094
Phosphite as a light stabilizer and functional additive for polyvinyl chloride
Inventors:
Lanny E. Todd, William Meek
Patented Case
View Patent ↗
Granted: Jan 28, 1992
Filed: May 9, 1990
Inventors
Lanny E. Todd
William Meek
Assignee (at issue)
Rhone-Poulenc, 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.