Granted Patent
Utility
US 6,557,646 · App. 10/068,327
Mulch-till ripper
Inventors:
Paul Hurtis, Joseph M. Keeler, Timothy R. Blunier, Marvin Kuebler
Patented Case
View Patent ↗
Granted: May 6, 2003
Filed: Feb 6, 2002
Inventors
Paul Hurtis
Joseph M. Keeler
Timothy R. Blunier
Marvin Kuebler
Assignee (at issue)
Case GmbH
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.