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美国专利每周二发布,周四早上就可在Chemical patents plus上获得这些专利的全文信息。该站点包括了1975年至现在(以及1971-1974年的一部分),由美国专利和商标局发布的专利全文,1995年1月以来专利的图像。在Chemical Patents Plus上查找、浏览、显示专利名称及摘要等都是免费的,但需要预先注册,取得CAS的用户ID号。注册也是不收费的。选中后可付费订购影印件。
US patents are released every Tuesday and the full text of these patents is available on Chemical patents plus Thursday morning. The site includes images from 1975 to the present (and part of 1971-1974), full text of patents issued by the U.S. Patent and Trademark Office, and patents since January 1995. Searching, browsing, displaying patent titles and abstracts on Chemical Patents Plus is free, but requires pre-registration to obtain the CAS user ID. Registration is free. Paid option after ordering a copy of the copy.