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I have two Patents in my name and the company i used to work for. Just simple things i invented, but the cost to finalize the patent was horrendous. If you need a world patent the cost for just one item was near $250,000.
Only the USA will obviously be less. Its also dependent on the patent lawyer and his charges.
I wonder if a ? would be of any use to you for your product, you can ? artwork or logos and the cost is about $600 for the USA , but i doubt you can ? ideas so forget this, just throwing out suggestions.
Imageman
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