The trademark extension process includes the following steps:

1. Submit a renewal application within 6 months after the trademark expires.

2. Prepare materials, including copies of ID cards, trademark renewal registration applications, copies of original trademark registration certificates, agency power of attorney, etc.

3. Submit materials and pay fees.

4. Waiting for the acceptance notice, usually about 2-3 months.

5. Wait for substantive examination, usually within nine months.

6. Issue renewal approval certificate.

The above steps are the basic process of trademark extension. The specific time may vary and need to be completed according to official notifications and regulations. At the same time, it should be noted that the materials and procedures for trademark extension may vary according to different situations and regions. It is recommended that you read the relevant regulations and guidance carefully during specific operations.