MPEP 601: Content of Provisional and
The following are general application requirements for provisional and non-provisional applications.
The size of the sheets used for the applications should be 8.5 X 11 inches with the following margins used: Top 3/4inch, Left 1inch, Right 3/4inch and Bottom 3/4inch. There should be no holes in the sheet and the line spacing should be 1.5 or 2.0. The pages should be numbered in the middle and the USPTO prefers the numbering to be at the bottom of the page.