Granted Patent
Utility
US 6,551,401 · App. 09/692,377
Machine for coloring landscaping material
Inventors:
John R. Winistorfer, Douglas E. Grunder, Brent Lester
Patented Case
View Patent ↗
Granted: Apr 22, 2003
Filed: Oct 19, 2000
Inventors
John R. Winistorfer
Douglas E. Grunder
Brent Lester
Assignee (at issue)
Becker Underwood, 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.