Granted Patent
Utility
US 4,192,707 · App. 05/865,410
Heat treatment of chrysotile asbestos fibres
Inventors:
Roger W. Glass, Richard A. Kuntze
Patented Case
View Patent ↗
Granted: Mar 11, 1980
Filed: Dec 29, 1977
Inventors
Roger W. Glass
Richard A. Kuntze
Assignee (at issue)
Ontario Research Foundation
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.