What does it cost to file for and obtain a patent?

Filing a regular U.S. patent application may cost between $10,000 and $20,000. To obtain an issued patent may require an additional $10,000 to $15,000 for patent prosecution. Filing and obtaining issued patents in other countries may cost $25,000 or more per country. Also, once a patent is issued in the U.S or in foreign countries, certain maintenance fees are required to keep the patent alive.