PI专利网站
PI专利网站:
1、http://www.powerint.com/company/patents/trademarks
附上两个搜索和下载专利的网站:
http://patft.uspto.gov/netahtml/PTO/index.html
http://www.freepatentsonline.com/
PI专利网站:
1、http://www.powerint.com/company/patents/trademarks
附上两个搜索和下载专利的网站:
http://patft.uspto.gov/netahtml/PTO/index.html
http://www.freepatentsonline.com/