How to cite a patent in APA Style

This article reflects the APA 7th edition guidelines. Click here for APA 6th edition guidelines.

A patent is a legal document acknowledging an invention as the intellectual property of its inventor.

To cite a patent in APA Style, list the name of the inventor, the year it was issued (in parentheses), the title of the patent (in italics), the patent number, the name of the issuing body, and the URL if available.

Format Inventor name, Initials. (Year). Title of patent (Country/Region Patent No. Number). Issuing Body. URL
Reference list Ghatak, S. (2020). Immunization testing system (U.S. Patent No. 10,788,482). U.S. Patent and Trademark Office. https://rb.gy/ik0fb0
In-text citation (Ghatak, 2017)

Where to find patent information

Intellectual property organizations generally keep a comprehensive record of their patents online. For example, try the website of the U.S. Patent and Trademark Office. To find patent offices across the world, check here.

Once you’ve found the relevant patent, all the information you need should be displayed:

Patent source info

Note that the URL can end up being quite long, as here; use a URL shortener if necessary.

Frequently asked questions about APA Style citations

When should I use “et al.” in APA in-text citations?

The abbreviation “et al.” (meaning “and others”) is used to shorten in-text citations with three or more authors. Here’s how it works:

Only include the first author’s last name, followed by “et al.”, a comma and the year of publication, for example (Taylor et al., 2018).

How many authors do I include in an APA reference list entry?

You may include up to 20 authors in a reference list entry.

When an article has more than 20 authors, replace the names prior to the final listed author with an ellipsis, but do not omit the final author:

Davis, Y., Smith, J., Caulfield, F., Pullman, H., Carlisle, J., Donahue, S. D., James, F., O’Donnell, K., Singh, J., Johnson, L., Streefkerk, R., McCombes, S., Corrieri, L., Valck, X., Baldwin, F. M., Lorde, J., Wardell, K., Lao, W., Yang, P., . . . O’Brien, T. (2012).

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Jack Caulfield

Jack is a Brit based in Amsterdam, with an MA in comparative literature. He writes and edits for Scribbr, and reads a lot of books in his spare time.

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