Granted Patent
Utility
US 6,305,561 · App. 09/483,083
Draft sill with locking center pin
Inventors:
Horst T. Kaufhold, Jeffery R. Ladendorf, John F. Oesch
Patented Case
View Patent ↗
Granted: Oct 23, 2001
Filed: Jan 14, 2000
Inventors
Horst T. Kaufhold
Jeffery R. Ladendorf
John F. Oesch
Assignee (at issue)
AMSTED INDUSTRIES INCORPORATED
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.