You will need:
Inventor’s surname and initials or organisation. (Year of publication) Title of patent document. Country/region patent number. Available from: www.webaddress.com [Accessed day month year]
Philip Morris Inc. (1983) Optical perforating apparatus and system. US patent 4404452 A. Available from: https://www.google.com/patents/US4404452 [Accessed 19 February 2021].
In-text citation: (Philip Morris Inc., 1983)