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 provides specific guidelines for line spacing and numbering in patent specifications:
- Line spacing: Lines of text should be 1.5 or double spaced
- Line numbering: The lines on each sheet should be numbered consecutively and at least 4 cm (1 1/2 inches) from the left margin
The MPEP states: ‘The specification (including the abstract and claims) for other than reissue applications and reexamination or supplemental examination proceedings shall have lines that are 1 1/2 or double spaced.’ It further specifies: ‘The lines on each sheet should be numbered consecutively, starting with 1, and the numbers should be located about 4 cm. from the left margin.’ These formatting requirements ensure clarity and ease of reference in patent documents.