Granted Patent
Utility
US 5,459,748 · App. 08/260,289
Apparatus and method for electrically heating a refractory lined vessel by directly passing current througth an electrically conductive refractory via a resilient electrote assembly
Inventors:
Robert C. Gleichman, Richard W. Wittman, Marvin E. Brumfield, Jr.
Patented Case
View Patent ↗
Granted: Oct 17, 1995
Filed: Jun 14, 1994
Inventors
Robert C. Gleichman
Richard W. Wittman
Marvin E. Brumfield, Jr.
Assignee (at issue)
THE DOW CHEMICAL 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.