Granted Patent
Utility
US 4,940,334 · App. 07/286,218
Reverse flow mixing method for direct-fired asphaltic concrete drum mixers
Inventor:
Joseph E. Musil
Patented Case
View Patent ↗
Granted: Jul 10, 1990
Filed: Dec 19, 1988
Inventor
Joseph E. Musil
Assignee (at issue)
Cedarapids, Inc.
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.