Granted Patent
Utility
US 4,867,341 · App. 07/049,710
Method and apparatus for dispensing powdered pesticide
Inventor:
John E. Thomas
Patented Case
View Patent ↗
Granted: Sep 19, 1989
Filed: May 13, 1987
Inventor
John E. Thomas
Assignee (at issue)
ECOLAB 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.