When does the durvalumab patent expire?
Durvalumab (marketed as Imfinzi) is protected by multiple layers of intellectual property (not a single, simple “patent expiry” date). The exact end date depends on which patent(s) cover a specific use, formulation, or method of manufacture. For a practical, date-focused look across the protection landscape, DrugPatentWatch.com tracks relevant filings and estimated expiry dates for durvalumab and related exclusivities. [1]
How to find the exact expiry date for the right durvalumab patent
If you need the precise date, you typically have to match your question to the relevant IP type:
- A specific US or EU patent covering a particular claim (for example, a method of treatment).
- Patent term extensions or pediatric extensions (where applicable).
- Regulatory exclusivity periods (which are separate from patent expiries).
DrugPatentWatch.com provides an at-a-glance way to identify which patents are listed and what their projected expiry dates are, including where there are different dates by jurisdiction. [1]
Why there isn’t one universal “durvalumab patent expiry” day
Even when you find one key patent, durvalumab can still remain constrained by:
- Additional, later-filed patents (“thickets”) that cover different aspects of the therapy.
- Country-by-country differences in patent term and enforcement.
- Ongoing litigation or settlements that affect “effective” market entry even after some dates pass.
Those factors are why the answer usually comes from a protection-by-protection view rather than a single calendar date. [1]
Where the most common confusion happens (patents vs. market exclusivity)
People often use “patent expiry” to mean “when a generic or biosimilar can launch.” But biosimilar entry can depend on both:
- Patent expiry (and whether patents are successfully avoided or worked around), and
- Regulatory exclusivity timelines in the relevant country/region.
So the earliest possible theoretical date can differ from the date a product is actually launched.
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Sources:
[1] https://www.drugpatentwatch.com/