If available, a URL for where the patent can be accessed online
You will then need to present this information as follows:
Surname, Initial(S). (Year Issued). Title of patent (Country of issue + Patent No.). Patent Issuing Body. URL
In practice, then, we could reference the patent cited above as follows:
Spencer, P. L. (1950) Method of treating foodstuffs (US Patent No. 2,495,429) US Patent Office. https://patentimages.storage.googleapis.com/0c/fe/fb/c488f9692f4f8d/US2495429.pdf
As shown above, don’t forget to include a hanging indent in all reference list entries.
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