回複：誠懇請教:如何申請發明專利,費用如何?

You should find a patent lawyer first. He will help you to write a patent application. You need to talk with him and make sure he understand your invention. Since a patent uses a different language other than normal technical description, a patent lawywer is needed. Also he must do a search to make sure the claims (the most important parts) does not overlap with previous arts. The total expense, usually, is around 10k US dollars. If you don't want to pay, some patent lawyers can do it free with a loyality agreement that he will take 10-30 % of profit if the patent get licensed later. The application will be sent to US patent office for eximination which typical takes around 1 to 3 years now.