Granted Patent
Utility
US 6,172,014 · App. 09/343,188
Method of lubricating compression cylinders used in the manufacture of high-pressure polyethylene
Inventor:
Douglas Meyers
Patented Case
View Patent ↗
Granted: Jan 9, 2001
Filed: Jun 30, 1999
Inventor
Douglas Meyers
Assignee (at issue)
Pennzoil-Quaker State 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.