What are the font requirements for a patent 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.

The MPEP 608.01 outlines specific font requirements for patent specifications:

• Font size: At least 0.21 cm (0.08 inch) high, or at least a 12-point font size
• Font style: The lettering must be a nonscript type font (e.g., Arial, Times Roman, or Courier)
• Color: Dark ink against a light background

The MPEP states: ‘The specification must have text written in a nonscript type font (e.g., Arial, Times Roman, or Courier, preferably a font size of 12) lettering style having capital letters which should be at least 0.3175 cm. (0.125 inch) high, but may be no smaller than 0.21 cm. (0.08 inch) high (e.g., a font size of 6).’ These font requirements ensure readability and consistency across all patent documents.