How long is the protection period of Japanese patents?

The protection period of Japanese patents is introduced respectively. The protection period of Japanese invention patents is 20 years, under certain conditions (inventions in the fields of chemistry and medicine can be extended by 5 years); The protection period of the utility model patent is 10 year; The protection period of the design patent is 15 years. The term of protection of invention patents and utility model patents is calculated from the date of application, while the term of protection of design patents is calculated from the date of registration.