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Check that you are using the standard abbreviations for patents
Citation Elements: Author(s) First name or initials. Surname, “Title of patent,” U.S. Patent [Patent authority] x xxx xxx [patent number], Abbrev. Month, day, year.
||J. Armstrong, "Methods and apparatus for generation and transmission of optical signals," U.S. Patent 7 796 898, Sept., 14, 2010.
For examples of how to reference digitised patents check the IEEE Editorial Style Manual.