USPTO全部工具（共 4 款）
- iP51商标查询检索iP51是中文界面的多国商标检索站，卖家按国家和尼斯分类扫美国、英国、欧盟、日本等地在先商标做品牌初筛，它不是任何国家的官方商标局，更不能代替官簿完成下证备案。
- 法空间法空间曾是面向中文卖家的免费美国商标分类查询页，但2026-09-06其官网HTTPS连接被重置，尚未证实关停，请改用美国专利商标局等官方登记簿进行检索和选类。
- 美国专利局跨境卖家发美仓或上架 Amazon.com 前，用美国专利商标局的 Patent Public Search 免费检索美国专利和公开申请，判断选品功能或外观是否已被占先。
- 美国商标局跨境卖家用美国专利商标局的 Trademark Search 和 Trademark Center 做品牌检索与联邦商标申请，作为进 Amazon Brand Registry 的官方入口。
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