If you have an idea for an invention, you need to have a patent to protect your idea from someone else stealing it or using it. You do not have to build your invention to earn a patent. The idea is enough. A patent gives you the right of ownership so you can build it or you can license your idea to someone else to make money.
Patent law is highly complex and has restrictions and processes to follow exactly and requires a lot of government paperwork to complete. patent attorney can help you with the patent process and ensure your patent is done right.
In legal practice, experience matters. An experienced attorney will likely have handled issues similar to yours many, many times. Therefore, after listening to your situation, the attorney should have a reasonable idea of the time line for a case like yours and the likely resolution.
An attorney consultation should provide you with enough information so that you can make an informed decision on whether to proceed with legal help.
Experience. Regardless of the type of legal matter you need help with, an experienced attorney will usually be able to get you better results.
Competence. Determine an attorney's expertise by asking about their track record for the issue you need help with resolving.
Fit. There are plenty of good attorneys out there; make sure you find one you are comfortable working with.