Ask for advice: How to accurately find the legal status of patent in China?

Legal status refers to the right type, right maintenance, right scope and right attribution of a patent application or authorized patent in a certain country at a certain point in time, which will directly affect the existence and scope of patent right. Considering from time and space, the legal status of patent generally includes four aspects: region, time, ownership and scope of protection. Among them, regionality mainly refers to: in which countries a patented technology has been patented, in which countries it has not been patented, and in which countries it may be protected in the future. In terms of time, it refers to: how long is the protection period of a technology in this country, whether it enters the protection period, and how long is the remaining protection time. The ownership of patent right mainly refers to whether the patent right of a certain technology has been transferred, who is the current patentee and who is the actual owner of the patent. The scope of patent protection mainly refers to whether there are follow-up procedures after patent authorization and whether the scope of patent protection has changed. The retrieval of patent legal status refers to the retrieval of the current legal status of a patent or patent application. Its purpose is to know whether the patent application is authorized, whether the authorized patent is valid, whether the patentee has changed, and how other information related to the legal status of the patent is. The common types of legal status retrieval mainly include: the patent right is valid, the patent term expires, the patent application is not authorized, the patent application is withdrawn or deemed withdrawn, the patent application is rejected, the patent right is terminated, the patent right is invalid or partially invalid, and the patent right is transferred. Among them, the term of validity of a patent refers to the patent that has obtained the patent right on the retrieval date and before the retrieval date and is still valid. In order to keep the patent valid, the patent should not only be within the legal protection period, but also the patentee should pay the annual fee on time according to the regulations. The expiration of the term of validity of a patent means that the searched patent has obtained a patent right on or before the retrieval date, but the term of validity of the patent right has exceeded the time limit stipulated in the Patent Law on or before the retrieval date. Patent application is not authorized, which means that the retrieved patent application has not been published on or before the retrieval date or has been published but has not been granted a patent right. This legal status is called that the patent application is not authorized. The withdrawal or deemed withdrawal of a patent application means that the searched patent was voluntarily withdrawn by the applicant or was judged as withdrawn by the patent institution on the retrieval date or before retrieval. The rejection of a patent application means that the retrieved patent application was rejected by the patent adjudication institution on the day of retrieval or before retrieval. The termination of patent right means that the searched patent has obtained the patent right on or before the retrieval date, but it is invalid before the expiration of the patent right due to the failure to pay the annual fee. The patent right is invalid or partially invalid, which means that the searched patent was granted a patent right on or before the retrieval date, but the patent right was judged invalid by the patent institution because the reasons for invalidation were established. The transfer of patent right refers to the change of the patentee or patent applicant of the searched patent or patent application on or before the retrieval date. The application scope of patent legal status retrieval mainly includes: technology introduction, product export, patent early warning, infringement litigation, market supervision and review opinions.