noun
patented article
A product protected by a patent, often used in commercial or legal contexts.
この部品は専売特許品なので、他社は製造できません。
This part is a patented article, so other companies cannot manufacture it.
特許 is the patent itself, while 専売特許品 is the physical product that is patented.
Compound of 専売 (monopoly, exclusive sale), 特許 (patent), and 品 (article, goods).