Granted Patent
Utility
US 4,671,765 · App. 06/830,783
Burner design for melting glass batch and the like
Inventor:
Yih-Wan Tsai
Patented Case
View Patent ↗
Granted: Jun 9, 1987
Filed: Feb 19, 1986
Inventor
Yih-Wan Tsai
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.