Granted Patent
Utility
US 4,308,447 · App. 06/067,556
Apparatus for liquefying meltable material
Inventors:
Norbert Notzold, Henning J. Claassen
Patented Case
View Patent ↗
Granted: Dec 29, 1981
Filed: Aug 16, 1979
Inventors
Norbert Notzold
Henning J. Claassen
Assignee (at issue)
Firma Henning J. Claasen
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.