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Originally Posted by piotr_boch
The patent is for "Wheels for a course stable self propelling vehicle
movable in any desired direction...". number pat. us 003876255 but I can't find this number  offis patent US
It is from 1975 and I think that patents normally expire after at most 20 years, so I would guess that it isn't valid any more. |
US Patents are good for 17 years. I'm not sure if that is from the date of application or the date of invention. In either case the mecanum patents are long expired. International patents are different. If you are in Poland, then US patents have no relevance. US Patents might be used to establish a date of invention for an international patent dispute. But they carry no weight in a different country, make all you want just do not sell them in the US. However International patents might apply. So you would have to check those out too.