You did not apply for a patent for a technical solution, but you cooperated with the manufacturer and signed a contract with the manufacturer as a service invention. This contract can be signed, but your rights must be stated in the contract. , which are the conditions for the manufacturer to hire you after your technical solution is successfully developed, such as: hiring you as a formal employee, hiring you as a technical director, etc. Otherwise, the manufacturer may be like you said, "The manufacturer kicked me after getting my plan." Besides, you are still an employee of that company making a service invention. If the manufacturer applies for a patent, the patentee is the manufacturer, but you are the inventor. Since there are contract conditions, you can protect your rights according to the contract. You said, "If the project development fails, then this manufacturer will not be able to continue to develop this project after I leave." This may not be able to restrict the manufacturer, because your solution has not applied for a patent, and it can only be regarded as a technical secret (or It’s called technical know-how). If it doesn’t succeed, after you leave the manufacturer, and someone else makes improvements and gets unexpected results, and it succeeds, then the manufacturer can develop and produce it, and at the same time, the manufacturer can also apply for patent protection. In short, when you sign a contract with a manufacturer, you should turn people's concerns into your rights and write them into the contract.