Granted Patent
Utility
US 4,313,722 · App. 06/188,430
Fluid shielded burner tip for use with a glass melting furnace
Inventor:
Jeffrey S. Yigdall
Patented Case
View Patent ↗
Granted: Feb 2, 1982
Filed: Sep 18, 1980
Inventor
Jeffrey S. Yigdall
Assignee (at issue)
PPG 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.