Granted Patent
Utility
US 6,253,969 · App. 09/433,999
Dispenser for viscous material
Inventors:
Thomas D. Nelson, Douglas G. Anderson, Ross A. Mackert
Patented Case
View Patent ↗
Granted: Jul 3, 2001
Filed: Nov 4, 1999
Inventors
Thomas D. Nelson
Douglas G. Anderson
Ross A. Mackert
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.