Granted Patent
Utility
US 4,426,493 · App. 06/290,761
Graft polyblend flow improvers for PVC
Inventor:
John C. Falk
Patented Case
View Patent ↗
Granted: Jan 17, 1984
Filed: Aug 7, 1981
Inventor
John C. Falk
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.