Frames for steel clad doors with jambs comprising a channel with spaced side walls and a bottom wall having integrally formed bracing connected to the walls at spaced points along the length

Granted: Nov 19, 2002 Filed: Dec 14, 2000

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.