Can I write the names of two partners on the American patent certificate?

Of course. By inquiring the information shown in Article 8 of the Patent Law, we can know that the right to apply for a patent belongs to the invention-creation jointly completed by two or more units or individuals, and the invention-creation entrusted by one unit or individual to other units or individuals, unless otherwise agreed. As you can see, the names of two partners can be written on the American patent certificate.