Granted Patent
Utility
US 5,435,528 · App. 08/226,615
Porous plug structure for aluminum furances
Inventors:
James R. Guttery, Gary B. Parker, Douglas V. Stewart
Patented Case
View Patent ↗
Granted: Jul 25, 1995
Filed: Apr 12, 1994
Inventors
James R. Guttery
Gary B. Parker
Douglas V. Stewart
Assignee (at issue)
Reynolds Metals Company
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.