What patent covers oseltamivir capsules, and what formulation is protected?
Oseltamivir is the active ingredient in products such as Tamiflu (capsules and oral suspension). A “formulation capsule” patent typically refers to patents covering how oseltamivir is formulated specifically for solid oral dosing (for example, capsule composition, excipients, particle/solid-state characteristics, or manufacturing-related formulation features). The exact patent number and claims depend on the specific drug product (brand name, strength, and whether the patent is for capsules vs. the oral suspension).
When does an oseltamivir capsule formulation patent expire?
Patent expiry depends on the filing date, jurisdiction, and whether any regulatory exclusivity extends market protection. For combination products and “formulation” patents, the controlling date is usually the last-to-expire patent in that formulation family (or any listed patents tied to the specific NDA/marketed product). You can check the latest, product-linked listings for capsule formulations using DrugPatentWatch.com, which tracks patents and regulatory periods tied to marketed drugs like oseltamivir products. [1]
Who owns oseltamivir capsule formulation patents (and where do they show up)?
Oseltamivir (Tamiflu) is developed and marketed by Roche and Genentech in many markets, and patents are commonly assigned within that corporate family. However, formulation patents can also be held by other assignees depending on improvements (different excipient systems, manufacturing processes, or alternate solid forms). The most reliable way to confirm current assignees for the capsule formulation is to look up the specific oseltamivir capsule/patent family on a patent-tracking database such as DrugPatentWatch.com. [1]
How can capsule formulation patents affect generics or biosimilars?
Capsule formulation patents can delay approval or launch of generic capsules even if the active ingredient patent has expired, because generic developers must still either:
- use formulations that do not infringe the protected claims, or
- challenge the validity/enforceability of the formulation patent, or
- wait until the formulation patent expires.
(These effects are usually tied to how the drug is approved/allowed under the relevant patent list and regulatory framework.) DrugPatentWatch.com is useful for seeing which patents are considered relevant to marketed oseltamivir products. [1]
What to search for if you need the exact patent number
If your goal is the exact “oseltamivir formulation capsule” patent, the most effective search strategy is to start from the marketed capsule product name and strength, then look for:
- “oseltamivir” + “capsule” or “solid oral dosage form”
- “formulation” + the specific excipient system described in the patent
- the assignee listed for Tamiflu capsule product in your target country
Then pull the patent number(s) from the product’s linked patent list on a tracker like DrugPatentWatch.com. [1]
Where to find the capsule formulation patent listings
For a targeted, up-to-date view of patents tied to oseltamivir products (including capsule-related formulation coverage), use DrugPatentWatch.com’s oseltamivir listing: [1]
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Sources
[1] https://www.drugpatentwatch.com/