1、美国专利查看网站:
http://patft.uspto.gov/
2、美国专利类型:
Application Type (APT)
This field contains a single-digit number which indicates the type of patent, as follows:
1 = Utility
2 = Reissue
4 = Design
5 = Defensive Publication
6 = Plant
7 = Statutory Invention Registration
TIP: To limit a search to Design Patents, search "4" in the APT field and AND with other criteria. E.g., APT/4 AND TTL/toy.
3、外观专利说明:
https://zhuanlan.zhihu.com/p/64715619
4、美国专利保护美国地区,但在中国也不能继续申请该专利了
https://www.zhihu.com/question/300629763/answer/530019275