The document identification code of this patent is

"Patent document type identification code" refers to the letter code or the combination code of letters and numbers specified by China National Intellectual Property Administration for identifying different types of patent documents. The category identification code of patent documents is expressed by capital letters or the combination of capital letters and Arabic numerals, and simple numbers cannot be used as the category identification code of patent documents.

Function of document identification code:

Its function is to classify articles according to their contents, so as to facilitate literature statistics and periodical evaluation, determine the scope of literature retrieval and improve the applicability of retrieval results. Details are as follows:

Academic papers on theoretical and applied research.

B- Practical technical achievement report (science and technology), theoretical study and social practice summary.

Business guidance and technical management articles.

General dynamic information.

Electronic documents and materials.