Crown Company Limited acquired patent for mixing device and spray bottle design. Detailed information are available in Japanese and English in https://www.j-platpat.inpit.go.jp/c1800/PU/JP-6493600/8D9DD3DEEC671EF9EE93E6575A4E30AB9D7DCA2C36722F5BDE3559CDF3881DF8/15/ja