Granted Patent
Utility
US 4,499,201 · App. 06/496,147
Process for removing alumina or silica substrate from carbonaceous pyropolymers
Inventor:
Richard W. Leyerle
Patented Case
View Patent ↗
Granted: Feb 12, 1985
Filed: May 19, 1983
Inventor
Richard W. Leyerle
Assignee (at issue)
UOP LLC
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.