Let's talk about the conditions for the establishment of priority first. It is required that the technical content of the "claim" applied later must appear in the application documents of the earlier application (including the claim and specification), which is not necessarily verbatim, but the substantive content must be the same.
When you have the experience of technology research and development and applying for a patent, you will get the priority:
1. Ensure that the technology is ahead: the technology has just been developed, but there is no mature technical scheme and no effective examples that meet the requirements of the patent specification. At this time, it is impossible to form an effective patent application document, but if you don't apply for a patent in time, the new technical scheme may be patented by competitors first; In this case, you can draft a patent first, and it is not necessary to write it beautifully, but you should write in the technology you have mastered, the technology you are studying and may realize; Within the validity period of the priority, wait until you have completed the technical research, and then apply later; In this way, you can not only keep ahead of the technology, but also ensure the smooth licensing of patents in the future.
2. Correcting the errors in the application documents: after the submission of the patent application documents, it is found that there are errors, omissions or deficiencies in the documents, which cannot be modified by making corrections. If it is still within the priority period, you can apply again by claiming priority.
3. Avoid the conflict of comparative documents: this has substantial effect, because after the priority of the later application is established, the starting point of searching comparative documents is the application date of the earlier application, and the starting date of the protection period after authorization is still the application date of the later application; Therefore, even a very complete patent document, if it is not used in a hurry, can also use the priority system to extend the patent protection period for one year in disguise.
I thought of these for the time being, I hope you can understand.