Granted Patent
Utility
US 4,298,289 · App. 06/098,360
Mixing device
Inventor:
Charles E. Walley
Patented Case
View Patent ↗
Granted: Nov 3, 1981
Filed: Nov 28, 1979
Inventor
Charles E. Walley
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.