Granted Patent
Utility
US 5,454,986 · App. 08/286,070
Down-flow batch mixing system
Inventor:
Martin Lessen
Patented Case
View Patent ↗
Granted: Oct 3, 1995
Filed: Aug 4, 1994
Inventor
Martin Lessen
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.