Turning Knowledge patent trading platform for you to answer:

1, the State Intellectual Property Office of China website:

(1) field search:

System provides 16 search fields, the user can be based on the known conditions, from the 16 search entry to make a choice, you can carry out a single-field retrieval or multiple-field limited Search. Each search field can be fuzzy search, with % (must use half-width format), representing an arbitrary letter, number or word; multiple fuzzy characters can be used, and can be entered into the search string at any position, the first position can be omitted.

(2) IPC classification search

IPC classification navigation search that is the use of IPC class table in the ministries, large classes, small classes, step by step query to the category of interest, click on the name of this category, you can get the patent search results under the category (except for designs).

IPC classification navigation search at the same time to provide keyword search, that is, under a selected category, in the invention name and abstract, etc. within the scope of the keyword search, to improve the accuracy of the search.

2, IncoPat Science and Technology Innovation Intelligence Platform

3, China Patent Information Network

4, China Intellectual Property Network

5, innojoy Patent Search Engine

6, Baiteng Network Patent Retrieval System

7, Patent Star - Patent Retrieval System

8, SOOPAT patent search engine

9, PatSnap wisdom buds patent search system