Patent ID: 8288592

Claim:
Solid state form of a salt of 3-[(1R,2R)-3-(dimethylamino)-1-ethyl-2-methylpropyl] phenol (tapentadol salt), wherein the salt of tapentadol is a dibenzoyl-(L)-tartrate salt, characterized by one or more of the following properties: i) a powder X-ray diffraction pattern in accordance with FIG. 3 ; ii) a powder X-ray diffraction pattern having peaks at 4.83, 5.76, 9.61, 16.08, 17.40 and 17.82Â±0.2 degrees 2-theta; iii) a powder X-ray diffraction pattern having peaks at 4.83, 5.76, 9.61, 11.72, 13.26, 14.39, 16.08, 17.19, 17.40, 17.82, 18.14, 18.90, 19.19, 20.88, 21.53, 21.88, 22.43, 22.78, 23.31, 23.53, 24.06, 26.58, 27.26, 27.98, 31.22, 34.75 and 34.96Â±0.2 degrees 2-theta; and iv) a differential scanning calorimetric (DSC) thermogram in accordance with FIG. 4 , wherein the dibenzoyl-(L)-tartrate salt of tapentadol is greater than 98% pure.