Assertion: patent's owner | /r/CapableOf | pay fee
Facets:
Source sentences:
text: To maintain the patent, the owner must pay a fee 3.5 years, 7.5 years, and 11.5 years after that patent has been issued.
text: Owners of patents who are benefiting from the patent system must pay these fees or their patent rights will expire before the maximum 20 years.