Granted Patent
Utility
US 4,422,848 · App. 06/344,208
Heat shields for drum aggregate driers and asphaltic drum mixers
Inventor:
Joseph E. Musil
Patented Case
View Patent ↗
Granted: Dec 27, 1983
Filed: Jan 29, 1982
Inventor
Joseph E. Musil
Assignee (at issue)
Iowa Manufacturing Company of Cedar Rapids, Iowa
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.