Granted Patent
Utility
US 4,920,519 · App. 06/783,854
Dual-pump mixing and feeding apparatus
Inventors:
Carl L. Brazelton, Troy C. Litherland, James G. Johnston
Patented Case
View Patent ↗
Granted: Apr 24, 1990
Filed: Oct 3, 1985
Inventors
Carl L. Brazelton
Troy C. Litherland
James G. Johnston
Assignee (at issue)
Stranco, 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.