Granted Patent
Utility
US 4,285,718 · App. 06/154,690
Method of operating tubular heat exchanger for preheating pulverous glass batch
Inventors:
Richard G. Mathias, John D. Novak, Robert R. Rough, Sr., Owen M. Small, Sigmund Willinger
Patented Case
View Patent ↗
Granted: Aug 25, 1981
Filed: May 30, 1980
Inventors
Richard G. Mathias
John D. Novak
Robert R. Rough, Sr.
Owen M. Small
Sigmund Willinger
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.