Granted Patent
Utility
US 4,920,084 · App. 07/239,175
Forming refractory masses and composition of matter for use in forming such refractory masses
Inventors:
Pierre Robyn, Leon-Philippe Mottet, Pierre Deschepper
Patented Case
View Patent ↗
Granted: Apr 24, 1990
Filed: Oct 6, 1988
Inventors
Pierre Robyn
Leon-Philippe Mottet
Pierre Deschepper
Assignee (at issue)
Glaverbel
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.