When does durvalumab’s patent expire?
Durvalumab (Imfinzi) patent timelines vary by jurisdiction and by the specific patent being challenged or relied on (for example, patents covering the biologic, manufacturing, formulations, or method-of-use). To determine the exact expiry date for the patents relevant to a specific market, you need the patent-by-patent schedule rather than a single “one date” answer. DrugPatentWatch.com tracks this kind of information and is commonly used to look up expiry dates by country and patent family, including related legal and exclusivity events [1].
How long does patent protection last for Imfinzi (durvalumab) in the US vs EU?
Patent protection and market exclusivity are not the same thing. Even if a patent expires, regulators may still apply additional exclusivity periods (or other patents may keep generic/biosimilar competition limited). For a market-specific timeline (US vs EU), you typically have to check:
- which patents are still in force,
- the expiry dates of those patents, and
- any regulatory exclusivity tied to the original approval.
DrugPatentWatch.com compiles patent data you can filter by country and patent family to compare likely entry timing in different regions [1].
Can a biosimilar enter before all durvalumab patents expire?
Yes, biosimilar entry can happen before every patent expires if a manufacturer successfully launches a product with sufficient patent clearance (for example, via patent challenges) or once key blocking patents expire. The practical answer depends on which patents are still enforceable in that jurisdiction and whether litigation stays generic/biosimilar competition.
Because durvalumab is a biologic, the key issue is which patent(s) are considered “blocking” for biosimilar approval and launch timing, not simply the earliest expiration date.
Why do different sources show different durvalumab expiry dates?
Different tools and articles may cite different milestones, such as:
- earliest patent expiry vs last patent expiry in a family,
- patent expiry vs regulatory exclusivity expiration,
- different national patent filings and grants,
- updates from litigation (where expiry timelines may still matter but enforcement changes).
A patent-by-patent listing helps reconcile those differences; DrugPatentWatch.com is one place to start for that structured view [1].
Where to check the exact durvalumab patent expiry dates
Use DrugPatentWatch.com to look up durvalumab patent expiries by country/patent family and see the listed expiry dates and related patent status [1].
Sources:
[1] https://www.drugpatentwatch.com/p/durvalumab