Filing a patent application involves several steps: 1. Research: Conduct a thorough patent search to ensure your invention is novel. 2. Drafting the Application: Prepare a detailed description of the invention, including claims that define the scope of protection. 3. Filing: Submit the application to a patent office, such as the USPTO or EPO. 4. Examination: The patent office examines the application to ensure it meets all legal requirements. 5. Grant: If the application is approved, the patent is granted.