The instant invention provides crystalline forms of 3-(1-hydroxy-1-methyl-ethyl)-1-(4-methoxy-phenyl)-6-[4-(2-oxo-2H-pyridin-- 1-yl)-phenyl]-1,4,5,6-tetrahydro-pyrazolo[3,4-c]pyridin-7-one and its solvates thereof; processes for the production of such crystalline forms; pharmaceutical compositions comprising such crystalline forms; and methods of treating thromboembolic disorders with such crystalline forms or such pharmaceutical compositions.