Granted Patent
Utility
US 5,037,600 · App. 07/516,358
Method of applying a polyolefin coating to pipe
Inventor:
Thurman H. Upchurch
Patented Case
View Patent ↗
Granted: Aug 6, 1991
Filed: Apr 30, 1990
Inventor
Thurman H. Upchurch
Assignee (at issue)
AMSTED INDUSTRIES INCORPORATED
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.