Go to China National Intellectual Property Administration's website, there is a patent search on the right side of the page, and click advanced search;
(1) According to the classification number
On the right side of the page that comes out, click IPC for classified retrieval;
On the left side of the page, there is an IPC classified directory, which is very complicated, tree-shaped and has many layers. You can find the classification number related to your major without looking for a lower level. For example, if it is the direction of network communication, then according to this level: electric-electric communication technology-transmission of digital information, at this time, the classification number H04L is generally related to network communication, and the preparation for the exam is similar and not very accurate. There are many subdivisions under H04L. If you want to search further, you can continue to click on the category number of interest.
Find the satisfactory classification number, click search, and all the application documents in related fields will come out;
Just look at the application for invention patent, regardless of utility model and appearance, and click "Article xxxx of invention patent".
(2) display keywords
As long as you directly enter keywords in the "abstract" column, such as "network", most of the documents you get are related to network communication.
2 How to confirm that the application documents have corresponding English versions?
What we are looking for is a PCT application from an English-speaking country, and such an application usually has an English public text. It doesn't matter if you don't know what a PCT application is now, just follow this step.
Look at the application number of the document obtained in the previous step. If the format conforms to xx8xxxxx.x or 200x8XXXXX. X, then it is a PCT application;
Click on this document to see its international publication number column. There will be a Chinese character representing its international publishing language. Just look for the word "English"
If yes, write down its international publication number and the code starting with WO before "English";
Download its Chinese text;
3 Get a comparison of English versions.
Visit WIPO website to find http://www.wipo.int/pctdb/en/. patent search.
Enter the international publication number just written down in the publication number column;
Click Search, and then click Open to get the file;
There are multiple tabs on the page; Click the Documents tab;
Find InitialPublication and click Download next to it to select pdf format;
Congratulations, I got the comparison between English version and Chinese version.