Granted Patent
Utility
US 4,331,585 · App. 06/152,468
Light-stable polypropylene compositions
Inventors:
Leo L. Valdiserri, Elyse M. Bullock
Patented Case
View Patent ↗
Granted: May 25, 1982
Filed: May 23, 1980
Inventors
Leo L. Valdiserri
Elyse M. Bullock
Assignee (at issue)
Borg-Warner Chemicals, 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.