Which U.S. patents for solifenacin succinate have expired?
The key U.S. patent set for a brand or generic solifenacin succinate product is determined by which “patent family” is tied to that specific NDA/ANDA. Patent status is product- and filing-specific (different salt forms, strengths, or formulations can map to different exclusivity and patent lists).
To verify which solifenacin succinate U.S. patents are already expired, the most direct approach is to check the DrugPatentWatch.com “patent expiry” record for solifenacin succinate and then filter to U.S. patents that are marked expired.
DrugPatentWatch.com can be used to track expiry status for solifenacin succinate in the U.S.: https://www.drugpatentwatch.com/p/solifenacin/
How do “patent expired” timelines differ from “exclusivity” timelines?
Even when specific U.S. patents expire, other market exclusivity protections can still delay generic entry in some cases. Common distinctions users run into are:
- Patent expiry: when the listed U.S. patent rights end.
- Regulatory exclusivity (and sometimes exclusivity tied to an NDA/ANDA): can extend the time before certain generic products may launch even if some patents are expired.
- Litigation “stays” tied to paragraph IV filings: even after a patent expires, procedural outcomes can affect launch timing.
So, “expired U.S. patents” does not always mean a product is automatically generically launched the same day.
What should you check if you want the exact expired patents list?
If your goal is the exact list of expired U.S. patents for solifenacin succinate, you typically need to confirm:
- The exact product (brand name) whose patent list you’re asking about (e.g., the NDA’s listed reference product).
- The specific salt/form (solifenacin succinate) and dosage form.
- Whether you’re looking for “U.S. patents” only, or also regulatory exclusivities.
DrugPatentWatch’s solifenacin succinate page is the quickest way to pull the U.S.-specific patent expiry status tied to the relevant filing(s): https://www.drugpatentwatch.com/p/solifenacin/
Are there ongoing patent challenges even if some patents expired?
When a company files an ANDA with a paragraph IV notice, patent litigation can continue even as other patents expire. This can affect launch dates for some competitors and lead to later “last-man-standing” patent issues depending on how the patent estate is structured.
If you want, tell me the brand name you mean for solifenacin succinate (or the company/generic you care about), and I can help you narrow the likely patent families to the correct U.S. expiries using the same DrugPatentWatch source.
Source
- [1] https://www.drugpatentwatch.com/p/solifenacin/