Granted Patent
Utility
US 5,188,661 · App. 07/790,555
Dual port lance and method
Inventors:
Donald R. Cook, Joseph A. Macri
Patented Case
View Patent ↗
Granted: Feb 23, 1993
Filed: Nov 12, 1991
Inventors
Donald R. Cook
Joseph A. Macri
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.