Granted Patent
Utility
US 4,909,721 · App. 07/311,809
Mold apparatus for molding containers and forming hole therein
Inventor:
Richard T. Warburton
Patented Case
View Patent ↗
Granted: Mar 20, 1990
Filed: Feb 16, 1989
Inventor
Richard T. Warburton
Assignee (at issue)
Mobil Oil 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.