http://iplib.noip.gov.vn

Digital Library of Industrial Property (IP LIB) of the Intellectual Property Office of Viet Nam (IP Viet Nam): Allows users to search all patent applications and granted patents filed in Vietnam, as well as trademarks and industrial designs filed in Vietnam.

http://digipat.noip.gov.vn

Digital Library of Vietnamese Patents: A search software built to enable users to search and view full-text specifications of patents for inventions and utility solutions protected in Vietnam.

http://www.wipo.int/pctdb/en/

PATENTSCOPE Patent Search Service of the World Intellectual Property Organization (WIPO): Contains all international patent applications filed with WIPO since 1978 (full-text data available from 1978 onwards).

http://patft.uspto.gov/

Patent Database of the United States Patent and Trademark Office (USPTO): Includes granted patents issued by the USPTO since 1790 and published US patent applications since 2001 (full-text data available from 1976 onwards).

http://www.j-platpat.inpit.go.jp/web/all/top/BtmTopEnglishPage/

Industrial Property Digital Library (IPDL) / Japan Platform for Patent Information (J-PlatPat): Operated by the National Center for Industrial Property Information and Training under the Japan Patent Office (JPO). The patent and utility model gazette database includes Japanese patent specifications since 1985, published patent applications in Japan since 1975, and granted patents in Japan since 1996 (full-text data available from 1993 onwards).

http://worldwide.espacenet.com/

Patent Database of the European Patent Office (Espacenet): Includes all patent applications filed at the European Patent Office (EPO) since 1978. The Worldwide database allows searching for published patent applications across 90 countries and territories (collected from WIPO's PCT database as well as national patent databases).