Granted Patent
Utility
US 4,891,339 · App. 07/113,215
Process and apparatus for the flame preparation of ceramic powders
Inventors:
Hartwell F. Calcote, William Felder
Patented Case
View Patent ↗
Granted: Jan 2, 1990
Filed: Oct 23, 1987
Inventors
Hartwell F. Calcote
William Felder
Assignee (at issue)
Aerochem Research Laboratories, 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.