Roberto, I hope you consulted with a lawyer before you took your current position. I should preface my comments with the fact that I'm not a lawyer but I am generally familiar with intellectual property. I believe that if the mount is sold in the U.S., either directly or indirectly, you could be subject to triple damages for willful infringement. You also need to be aware of countries that have patent treaties with the US (Canada, for example).

You might consider patenting your improvements to the original mount and then you might be able to arrange some cross-licensing of patent rights if Mr. Hyde is interested and then you could lawfully sell it anywhere.