In the first step, you need to write down the details of the invention. The preparation of Patent document is also called drafting a patent application.Patent Center Overview provides details on how to file an application in Patent Center. Quick Clinic Video Series. Choosing when to start the patent process is a critical decision for startups. The right time is based on a combination of business and legal factors. Getting a patent in California is the same as any other state. The patent application is filed with the United States Patent and Trademark Office (USPTO). A stepbystep overview of a patent application and maintenance process. The five stages of a patent process.