Patent ID: 8512753

Claim:
Micronized crystalline particles consisting of formoterol fumarate dehydrate, wherein: (i) no more than 10% of said particles have a volume diameter [d(v,0.1)] lower than 0.8 micron; (ii) no more than 50% of said particles have a volume diameter [d(v,0.5)] lower than 1.7 micron; (iii) at least 90% of said particles have a volume diameter [d(v,0.9)] lower than 10 micron, (iv) a ratio [d(v,0.9)−d(v,0.5)]/d(v,0.5) is 1.4 to 2.0 micron; and said particles have a specific surface area of 5.2 to 6.5 m 2 /g.