Granted Patent
Utility
US 4,932,156 · App. 07/269,269
Method of controlling the color of mulch
Inventor:
Roger C. Underwood
Patented Case
View Patent ↗
Granted: Jun 12, 1990
Filed: Nov 9, 1988
Inventor
Roger C. Underwood
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.