Drawing Size - 37 CFR 1.84(k)

Updated: Mar 17

"The scale to which a drawing is made must be large enough to show the mechanism without crowding when the drawing is reduced in size to two-thirds in reproduction." - PTO


The inputs provided by the client to finalize drawings are in different forms, like images, pdf, PowerPoint slides, word documents, Visio and even sometimes videos. Most of the times, it is required to trace the images and update or edit the drawings as per the requirements of the invention. It is very important that the drawing should be scaled up properly so that it's all features are clearly visible.


"37 CFR 1.84(k)" of Manual of Patent Examining Procedure (USPTO) states clearly, "Indications such as "actual size" or "scale 1/2" on the drawings are not permitted since these lose their meaning with reproduction in a different format."


"Rule 11.13 (c)" of PCT under Physical Requirements of the International Application states, "The scale of the drawings and the distinctness of their graphical execution shall be such that a photographic reproduction with a linear reduction in size to two-thirds would enable all details to be distinguished without difficulty."


Here I want to cite an example for a published patent US20200176086A1. I received an 'Invitation to correct defects'. There were few reasons for the rejection and one of them was the size of the drawing and height of the text.

Invitation to correct defects


Non standard text height and drawing scale

I came across many such cases. So, please contact experienced patent drawing illustrators to finalize your drawing to avoid rejections.


You may reach out to me if you want any guidance or help related to patent drawings. Feel free to drop me an e-mail at info@desillus.com or call me at 1-647-403-7719

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