How should graphical drawings be prepared for a patent application?
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.
Graphical drawings in patent applications must meet specific requirements to ensure clarity and reproducibility. According to MPEP 608.02:
“The graphic forms in drawings are lines, numbers, and letters. Drawings should be prepared with the proper rendition of graphic forms.”
Key guidelines for preparing graphical drawings include:
- Use solid black lines of uniform thickness
- Choose line thickness appropriate for the scale and complexity of the drawing
- Avoid shading unless necessary to show the shape of elements
- Use reference characters (numbers, letters) consistently throughout the application
- Ensure all text is legible and at least 1/8 inch (0.32 cm) in height
- Avoid crowding; leave sufficient white space between elements
The MPEP also states: “All drawings must be made by a process which will give them satisfactory reproduction characteristics.” This means the drawings should be clear, sharp, and suitable for reproduction in both paper and electronic formats.