The "Meiriju" you mentioned should refer to the trademark. The registration number of this trademark is 3503211 (which should be the patent number you mentioned, but the trademark is not called a patent number, but a registration number or application number. Yes)

Registered trademarks, icons, and trademarks are distinctive signs that identify a certain product, service, or a specific individual or enterprise related to it. Graphics are often used to indicate that a trademark is registered and protected by law.