Field-of-use limitation
（重定向自Field of use）
A field-of-use limitation is a provision in a patent license that limits the scope of what the patent owner authorizes a manufacturing licensee (that is, a licensee that manufactures a patented product or performs a patented process) to do in relation to the patent, by specifying a defined field of use -- that is, a defined field of permissible operation by the licensee. In addition to affirmatively specifying the field of use, the license may negatively specify a field or fields, by specifying fields of use from which the licensee is excluded.