The written description requirement is really the backbone of the quid pro quo between the public and the patent applicant. In exchange for information about an invention, society is willing to grant the applicant a patent, which conveys exclusive rights for a limited period of time to what is claimed, not described. But the description provided in the specification must demonstration that the applicant really has an invention in the first place and what the boundaries of that invention are—this is the written description requirement in lay terms.

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