Does anyone know who invented the ball point pen?

ball point pen inventor - Google Search (http://www.google.com/search?q=ball+point+pen+inventor&rls=com.microsoft:en-us&ie=UTF-8&oe=UTF-8&startIndex=&startPage=1&rlz=1I7ADFA_en)
Hopefull this helped.
The person who thought of it, may not have gotten the credit or patent for it.