Granted Patent
Utility
US 4,889,433 · App. 07/311,336
Programmable apparatus and method for delivering microingredient feed additives to animals by weight
Inventor:
William C. Pratt
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Feb 16, 1989
Inventor
William C. Pratt
Assignee (at issue)
Micro Chemical, 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.