Granted Patent
Utility
US 4,802,771 · App. 06/846,372
Mixing apparatus
Inventor:
Ronald J. Weetman
Patented Case
View Patent ↗
Granted: Feb 7, 1989
Filed: Mar 31, 1986
Inventor
Ronald J. Weetman
Assignee (at issue)
Federal Signal Corporation
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.