Granted Patent
Utility
US 4,386,765 · App. 06/313,437
Composite moulded refractory articles
Inventors:
Michael Roberts, Martin Copperthwaite
Patented Case
View Patent ↗
Granted: Jun 7, 1983
Filed: Oct 21, 1981
Inventors
Michael Roberts
Martin Copperthwaite
Assignee (at issue)
USS Engineers and Consultants, 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.