I occasionaly do some product design for a well established injection moulding company, its mainly consumer products but sometimes automotive items, often these are injection moulded in plastics, and or wax for casting, I also do some injection mould tool design, the Software (they own the seat) I use does the cad side, Core Cavity separation, split line recognition, draft analysis, has a library of die sets ejection pins, guide bushed etc etc etc, it also does the cam side, I think its recognised as the industry standard in this field, its a British software company, I think the first version I used was back in 2001 I know it existed before this.
Patents often get granted, even though there is obvious prior art in existence, it depends a lot on the country, and also the patent examiner, keep in mind patent lawyers have to make a living……usually from idiots with an idea for a fifth leg on a horse. 