Granted Patent
Utility
US 4,326,871 · App. 06/120,022
Cooling tubes for glass filament production apparatus
Inventor:
Walter William Harris
Patented Case
View Patent ↗
Granted: Apr 27, 1982
Filed: Feb 11, 1980
Inventor
Walter William Harris
Assignee (at issue)
Manville Service Corporation
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.