Use a column, figure or item pincite

Error²Federal courts, Illinois courts21st and 22nd editions

A patent's text is cited by column and line, a drawing by its figure number, and a part of a drawing by the item number within that figure; a page or a paragraph number cites nothing a patent has.¹

1. 1T1.2 Department of Commerce, Patent and Trademark Office (USPTO). Tables: R. 3.2 Pages, Footnotes, Endnotes, and Graphical Materials.
2. 2An error: the rule in note 1 allows one form, and this is not it.