1. application fee: most countries have application fees, which generally range from several hundred to several thousand dollars.
2. Publishing fee: Most countries require a patent to be publicly applied, which usually requires a certain fee, which is roughly between several hundred and several thousand dollars.
3. Actual trial fee: After the initial examination of the patent application is passed, the actual trial fee will be paid for the substantive examination. The cost varies from country to country, usually between several hundred and several thousand dollars.
4. Maintenance fee: Once the patent application is approved, a certain fee needs to be paid every year or several years to maintain the validity of the patent. The cost varies from country to country, usually between several hundred and several thousand dollars.
Generally speaking, the patent application fee is a complicated issue, which needs to be analyzed in detail and decided by combining the applicant's own funds.