Fibrinolysin derived from blood and methods of obtaining the same

Claim 1

METHOD FOR OBTAINING PROFIBRINOLYSIN WHICH COMPRISES TREATING SERUM OF THE CLASS MAMMALIAN BLOOD SERUM AND MAMMALIAN BLOOD SERUM CONTAINING THROMBOPLASTIN AND FIBRINOGEN BUT NO PROTHROMBIN, WITH A PROTEIN PRECIPITATING WATER SOLUBLE SULFATE SALT, AT TEMPERATURES ABOVE FREEZING FOR SAID SERUM AND BELOW THAT CAUSING PROTEIN DENATURATION, AT A MAXIMUM CONCENTRATION OF SAID SALT FOR PRECIPITATING PROTEIN ABOVE THAT CORRESPONDING TO ABOUT 20 PERCENT OF SATURATION WITH AMMONIUM SULFATE AND BELOW THAT CORRESPONDING TO ABOUT 35 PERCENT OF SATURATION WITH AMMONIUM SULFATE NOT CAUSING SUBSTANTIAL PRECIPITATION OF PROFIBRINOLYSIN CONTAINED THEREIN, REMOVING THE SOLUTION CONTAINING PROFIBRINOLYSIN FROM PRECIPITATED PROTEINS, INCREASING THE CONCENTRATION OF SAID WATER SOLUBLE SULFATE SALT IN THE SOLUTION CONTAINING PROFIBRINOLYSIN TO A DEGREE OPTIMAL FOR PRECIPITATION OF PROFIBRINOLYSIN WITH MINIMUM PRECIPITATION OF IMPURITIES AND WITHIN THE ABOVE LIMITS OF CORRESPONDING AMMONIUM SULFATE SATURATION, AND SEPARATING THE PRECIPITATED PROFIBRINOLYSIN FROM THE SOLUTION.