Granted Patent
Utility
US 4,813,784 · App. 07/089,179
Reverse flow post-mixer attachment and method for direct-fired asphaltic concrete drum mixers
Inventor:
Joseph E. Musil
Patented Case
View Patent ↗
Granted: Mar 21, 1989
Filed: Aug 25, 1987
Inventor
Joseph E. Musil
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.