Granted Patent
Utility
US 5,380,786 · App. 07/634,783
Polyvinyl chloride blends having improved physical properties including low temperature brittleness
Inventors:
William S. Greenlee, Josef C. Vyvoda, Roman W. Wypart
Patented Case
View Patent ↗
Granted: Jan 10, 1995
Filed: Dec 27, 1990
Inventors
William S. Greenlee
Josef C. Vyvoda
Roman W. Wypart
Assignee (at issue)
The Geon Company
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.