Engineering Village检索
Engineering Village offers access to 12 engineering literature and patent databases providing coverage from a wide range of trusted engineering sources.www.engineeringvillage.com
进入网站 - 2015-12-19Espacenet欧洲专利局数据库
Espacenet:欧洲专利局数据库提供90余个国家和组织的专利信息,英语、德语、法语界面。帮助你了解世界专利的最新情况,以及查询已有的专利信息。Espacenet: free access to the database of over 90 million patents
进入网站 - 2015-10-25United States Patent and Trademark Office
Home page of the United States Patent and Trademark Office's main web site.United States Patent ,Trademark Office,www.uspto.gov
进入网站 - 2015-04-29