Each Kokoku disc contains about 1800 examined patent applications and 1000 examined utility model applications. About 50 discs are issued per year 7 . These include Kokai divided into the broad fields of chemistry, mechanics physics, and electricity. The Hitachi systems are endorsed and handled by Japio. Of the domestic licensees, about eight are to large information providers with unlimited licenses costing 82,400 yen per disc per year for the Kokai edition.
Licenses are available quarterly on a prepaid basis.
No back issues are or will be available.