Patent ID: 11896722
Assignee: PURDUE PHARMA L.P.
Field: Pharmaceuticals (Chemistry)
Classification: CPC A | IPC A

Claim 4:
5. The method of claim 4, wherein the dosage form has the following in vitro methylphenidate dissolution profile:, Time (hours)
Methylphenidate (% dissolved)

 1
NLT 15%

 4
18-38%

 8
35-55%

12
68-98

16
NLT 68

with 900 ml simulated gastric fluid for 2 hours, (ii) followed by 900 ml phosphate buffer pH 6.0 for 4 hours, and (iii) for the 7th hour onwards, 900 mL of phosphate buffer pH 7.4; USP<711> Acceptance Table 2.