Granted Patent
Utility
US 5,964,231 · App. 09/153,449
Systems for purging process lines of additives for thermoplastic materials
Inventors:
Daniel H. Kight, Carl R. Holzer, Jr., Dan R. Yon
Patented Case
View Patent ↗
Granted: Oct 12, 1999
Filed: Sep 15, 1998
Inventors
Daniel H. Kight
Carl R. Holzer, Jr.
Dan R. Yon
Assignee (at issue)
BASF SE
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.