Why don't some patents have to pay the third year fee?

As follows:

1, utility model patent. Annual fee for individual application for utility model patent: 1-3 years in 600 yuan, 4-5 years in 900 yuan, 6-8 years 1200 yuan, 9- 10 years 2000 yuan.

2. Fee reduction and exemption. Individual minus 135 yuan, unit minus 270 yuan.

3. There is a delay in patent payment, that is, all fees are not paid within the specified time.