US Patent

US9872837 — Tamper resistant controlled release dosage forms

Formulation · Assigned to Purdue Pharma LP · Expires 2031-12-21 · 6y remaining

Vulnerability score 31/100 Strong — defensible against typical IPR challenges

What this patent protects

This patent protects a tamper-resistant controlled-release dosage form of an opioid analgesic, specifically designed to release a consistent amount of the medication over a period of time.

USPTO Abstract

In certain embodiments, the present invention is directed to a solid controlled release dosage form comprising: a core comprising a first portion of an opioid analgesic dispersed in a first matrix material; and a shell encasing the core and comprising a second portion of the opioid analgesic dispersed in a second matrix material; wherein the amount of opioid analgesic released from the dosage form is proportional within 20% to elapsed time from 8 to 24 hours, as measured by an in-vitro dissolution in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37 C.

Drugs covered by this patent

Patent Metadata

Patent number
US9872837
Jurisdiction
US
Classification
Formulation
Expires
2031-12-21
Drug substance claim
No
Drug product claim
Yes
Assignee
Purdue Pharma LP
Source
FDA Orange Book + USPTO grounding via Google Patents

Bibliographic data sourced from FDA Orange Book + USPTO public records. Plain-English summary generated by AI grounded in source text. Patent term extensions (PTR, SPC, pediatric) may shift the effective expiry. Not legal advice.

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