Patent Glossary L

Patent Glossary L. What is license, literal infringement, level of ordinary skill?

Lapse Date

The date when a patent is no longer enforceable in a jurisdiction due to a failure to pay renewal (maintenance) fees. Often, the patent can be reinstated if appropriate fees are paid within a limited period after the lapse date.

Level of Ordinary Skill

The level of skill in the art(s) to which an invention pertains that is used in judging whether a disclosure or claim is enabling. MPEP 2141.03.


Any conveyance of a right under a patent that is not an assignment (transfer of ownership).


Language in a claim that constrains the breath of a claim.

Literal Infringement

See Infringed Literally.


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