dont patent
If you make or build a device or parts which could have a military use your respective government as soon as you apply for patent will take it. You will get NO compensation and the threat of a long prison sentence if you ever tell ANYONE about it. This is also the reason that no antigravity or other devices of free power have never been seen.
Even if you get passed this and spend a small fortune on worldwide patents by doing so giving details of your idea or device to china and others. These counties will take no notice of the patent and go into production on a very large scale, and even if you have patent insurance to sue would ignore any court order and tie you up for many years while they sold the device.
The only way is to build the device yourself with finance from family members and close friends. If you cannot build for technical reasons then you have it made for you buy different companies in parts, each builder not knowing what the finished item will be. Each separate part ( one or thousands) is delivered to the address of one of the financers.
When you have all the parts they are taken to a secret factory location that you have setup and assembled. The finished items are not stored at this location but taken to respective financers homes or storage depending on size. This is in case somebody tries to seize or steal the devices. As you know what your invention will do you can now approach the large companies which are able to market it (unless you form your own) show them a sample and tell tem you can deliver x quantity immediately the cash is in your bank. This way you will have a head start on everybody else and nobody will be able to stop device going on sale. Others will make copies but this will take time and you will have made your fortune.
The explanation above is simplified and has to be carefully thought out an tailored to your needs by trusted people.
