What are the requirements for paper size and margins in a patent application specification?

This page is an FAQ based on guidance from the Manual of Patent Examining Procedure. It is provided as guidance, with links to the ground truth sources. This is information only: it is not legal advice.

According to MPEP 608.01, the specification must adhere to specific paper size and margin requirements:

• Paper size: 21.0 cm by 29.7 cm (DIN size A4) or 21.6 cm by 27.9 cm (8 1/2 by 11 inches)
• Margins: At least 2.0 cm (3/4 inch) on the top, bottom, and left sides; at least 2.5 cm (1 inch) on the right side

The MPEP states: ‘All papers which are to become a part of the permanent records of the U.S. Patent and Trademark Office must be on sheets of paper which cannot exceed 21.6 cm by 33.1 cm (8 1/2 by 13 inches) and which must have the following margins:’ followed by the margin specifications. These requirements ensure uniformity and readability of patent documents.