PCT is an international patent. One party can apply for a patent in any PCT member country. Applying for a national patent is a patent that the parties apply for in their country. Think about it and you'll know which is more convenient.
To apply for PCT, you can apply if you are from China, because China is a treaty country, but you must apply to the US patent department for invention.
Criteria for application documents
1。 PCT/R0/ 10 1 table, PCT security format.
2。 explain
3。 Claim document
4。 abstract
5。 attached drawing
6。 plan
When an international application is submitted, all PCT member countries are automatically established.
When entering the national protection stage, specify the protection type, and the optional protection type shall be subject to the national laws of the country, except for the design.