Granted Patent
Utility
US 4,460,533 · App. 06/376,089
Apparatus and method for the heat treatment of materials
Inventors:
Robert W. Duffy Cox, Herbert E. Janikowski, David L. Walker, David Hands
Patented Case
View Patent ↗
Granted: Jul 17, 1984
Filed: May 7, 1982
Inventors
Robert W. Duffy Cox
Herbert E. Janikowski
David L. Walker
David Hands
Assignees (at issue)
British Gas
Rubber & Plastics Research Assoc. of G. Britain
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.