Granted Patent
Utility
US 4,212,613 · App. 05/965,632
Apparatus for handling heat-softenable batch material
Inventor:
Stephen Seng
Patented Case
View Patent ↗
Granted: Jul 15, 1980
Filed: Dec 1, 1978
Inventor
Stephen Seng
Assignee (at issue)
Owens-Corning Fiberglas Corp.
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.