How can we extend the patent protection time?

In Article 42 of the Patent Law, the term of invention patent is 20 years, and the term of utility model patent and design patent is 10 years, counting from the date of filing. The Detailed Rules for the Implementation of the Patent Law stipulates the extension of the time limit in Article 6, but it also clearly stipulates that "the provisions in the first and second paragraphs of this Article shall not apply to the time limit stipulated in Articles 24, 29, 42 and 68 of the Patent Law".

The following methods can be used to achieve the purpose of extending the validity period:

1. If you apply for the patent of 1 before the priority, and apply for the patent at the end of the priority time of 1 year, and claim the priority of the earlier application, then the protection time can be one year longer than normal.

2. Continue to develop patents on the basis of the original patents, further promote the original patented technology, and still apply for patents, then the patent monopoly can be maintained.