Granted Patent
Utility
US 4,511,385 · App. 06/542,319
Forehearth for molten glass and method of using same
Inventors:
Marvin L. Barkhau, Joseph J. Kujawa
Patented Case
View Patent ↗
Granted: Apr 16, 1985
Filed: Oct 17, 1983
Inventors
Marvin L. Barkhau
Joseph J. Kujawa
Assignee (at issue)
Owens-Illinois Inc.
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.