Granted Patent
Utility
US 4,040,768 · App. 05/638,633
Mixing, conveying heating and/or cooling apparatus
Inventor:
Robert F. Christian
Patented Case
View Patent ↗
Granted: Aug 9, 1977
Filed: Dec 8, 1975
Inventor
Robert F. Christian
Assignee (at issue)
Jude Engineering, 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.