Granted Patent
Utility
US 4,487,621 · App. 06/535,514
Method of sealing glass furnaces to prevent air leakage
Inventor:
Ray S. Richards
Patented Case
View Patent ↗
Granted: Dec 11, 1984
Filed: Sep 26, 1983
Inventor
Ray S. Richards
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.