Assertion: exhaustion doctrine | /r/CapableOf | apply in particular case
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text: Because only an "authorized" sale triggers the doctrine, it may be difficult or at least controversial to determine whether the exhaustion doctrine applies in a particular case: for example, when the patentee purports to restrict or condition the use or resale of the patented article once purchased and in the hands of an end user (post-sale restrictions); or when the patentee licenses another to manufacture and use or sell the patented product only in a particular field.