Teacher:In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Teacher: Now, understand the problem? Solve this instance: A particular form of letters patent has evolved into the modern patent ( referred to as a utility patent or design patent in United States patent law ) .
Student:
A particular form of letters patent has evolved into the modern patent ( referred to as a utility patent or design patent in United States patent law ) granting exclusive rights in an invention ( or a design in the case of a design patent ) .