(b) not abundant in English data;

　　(c) providing online machine translation "CPMT (China Patent Machine Translation)" of partial file contents (for example, Claims).

　　2. China Patent Information Center:http://www.cnpat.com.cn>

　　"China Patent Information Center" is a institution directly subordinate to the State Intellectual Property Office, which provides patent database search. Its features are as follows:

　　(a) providing table search and advanced search, and supporting combined application of search formulas in the advanced search mode;

　　(b) a large size of database;

　　(c) not abundant in English data, and online machine translation provided to partial file contents (for example, Claims).

　　3. PATFT:http://patft.uspto.gov>

　　"PATFT (Patent Full-Text and Full-Page Image Databases)" is the online patent database hosted by USPTO (United States Patent and Trademark Office), which provides searches of patent granted by U.S. and the published patent applications which have not been granted yet. Its features are as follows:

　　(a) comprehensive contents, rapid update and providing full-text of the patent specifications since 1790 in image format and also full-page HTML files of patent specifications for patents which can be dated back to 1976;

　　(b) providing different search methods including quick search, advanced search, patent number search and etc.

　　4.esp@cenet: http://ep.espacenet.com>

　　esp@cenet>" is the online patent database of EPO (European Patent Office). Its features are as follows:

　　(a) providing several search methods including quick search, advanced search, search by patent number and classification search;