Granted Patent
Utility
US 4,552,579 · App. 06/559,160
Glass forehearth
Inventors:
John F. Blumenfeld, Frank Bubon
Patented Case
View Patent ↗
Granted: Nov 12, 1985
Filed: Dec 7, 1983
Inventors
John F. Blumenfeld
Frank Bubon
Assignee (at issue)
Emhart Industries, 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.