Granted Patent
Utility
US 6,357,172 · App. 08/872,601
Plant protector
Inventors:
Michael R. Risgaard, Thomas Frank
Patented Case
View Patent ↗
Granted: Mar 19, 2002
Filed: Jun 10, 1997
Inventors
Michael R. Risgaard
Thomas Frank
Assignee (at issue)
Teel Plastics, 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.