McDonald's wants to own the rights to how a sandwich is made.
The fast-food chain has applied for a patent relating to the 'method and apparatus' used to prepare the snack.
The 55-page patent, which has been filed in the US and Europe, covers the 'simultaneous toasting of a bread component'.
Garnishes of lettuce, onions and tomatoes, as well as salt, pepper and ketchup, are inserted into a cavity in a 'sandwich delivery tool'.
The 'bread component' is placed over the cavity and the assembly tool is inverted to tip out the contents. Finally, the filling is placed in the 'bread component'.
It explains: 'Often the sandwich filling is the source of the name of the sandwich; for example, ham sandwich.'
McDonald's said: 'These applications are not intended to prevent anyone from using previous methods for making sandwiches.'
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