Granted Patent
Utility
US 4,212,958 · App. 05/932,585
Graft polyblend flow improvers for PVC
Inventor:
John C. Falk
Patented Case
View Patent ↗
Granted: Jul 15, 1980
Filed: Aug 10, 1978
Inventor
John C. Falk
Assignee (at issue)
BorgWarner 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.