Is it ok to copy a W5 head and make it better or are we just mad at Speedmaster

Ok test time

1. How long is a patent good for?

2. Who is responsible for fees involved in fighting patent claims?

3. If a patent is filled in America is it illegal for someone in China to go against the patent and copy a product?
1. 20 years
2. The Patent Holder
3. No, but the Chinkaboos don't give a sh*t about no stinking rules anyway.....