Granted Patent
Utility
US 5,160,639 · App. 07/719,067
Lime-tree preformed shapes for casting aluminum
Inventor:
J. Michael McCollum
Patented Case
View Patent ↗
Granted: Nov 3, 1992
Filed: Jun 17, 1991
Inventor
J. Michael McCollum
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.