American invention patent: 20 years from the date of filing, and the maintenance fee is paid in the third and a half years, seven and a half years and eleven and a half years from the date of registration. The scope of protection relates to the patent of the composition or the method of using the composition, and its validity can be extended to 5 years at the longest.
American design patent: from the date of registration 14 years. You can still file a patent application within half a year after publication (this is a big difference between American patent novelty judgment and China patent).
Patent of new plant varieties: 20 years from the date of application, and the maintenance fee shall be paid in the third, seventh and eleventh years from the date of registration.
Extended data
Application route
There are three ways to apply for a patent in the United States:
1. Apply for a patent directly to the United States (confidentiality review is required in China Patent Office in advance, and you can apply for a patent directly to the United States after the confidentiality review is passed);
2. Apply for a patent in the United States through the Paris Convention (the priority is only 12 months);
3. Apply for a patent in the United States through the PCT Patent Cooperation Treaty (priority can reach 30 months).
Reference: Baidu Encyclopedia-American Patent System