Granted Patent
Utility
US 4,420,291 · App. 06/001,178
Dynamic cooler apparatus for molten thermoplastic material
Inventor:
Thomas W. Winstead
Patented Case
View Patent ↗
Granted: Dec 13, 1983
Filed: Jan 5, 1979
Inventor
Thomas W. Winstead
Assignee (at issue)
Maryland Cup Corporation
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.