noun
patent specification; patent description
A formal document detailing the technical scope and claims of a patent.
特許明細書には発明の詳細が記載されている。
The patent specification contains the details of the invention.
特許 is the patent itself or the patent right, while 特許明細書 is the written specification document.
Compound of 特許 (patent) + 明細書 (detailed statement document).