Granted Patent
Utility
US 4,428,730 · App. 06/401,458
Insulation for a furnace member
Inventors:
Clyde Holmes, Macy W. Vance
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Jul 26, 1982
Inventors
Clyde Holmes
Macy W. Vance
Assignee (at issue)
United States Steel 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.