What’s the “Lesinurad synthesis patent” and what does “WO” usually mean?
“WO” usually refers to a patent publication from the World Intellectual Property Organization (WIPO), where documents are often labeled like “WO YYYYxxxxxx.” Those filings commonly describe a compound and a specific manufacturing or synthesis route, not just the medicine itself.
Based on the information provided, there’s not enough detail to identify the exact Lesinurad synthesis patent you mean (for example, the specific WO number, assignee, or publication year). If you share the WO publication number (or the link/title/assignee), I can pinpoint what it covers and how it maps to Lesinurad.
How to identify the exact Lesinurad synthesis patent you’re looking for
When people search for a “synthesis patent” for Lesinurad, the patent record typically shows:
- A WO publication identifier (e.g., WO 201x/xxxxx).
- Applicant/assignee (company name).
- Patent family members in multiple countries.
- Claims tied to a particular synthetic step (intermediates, reaction conditions, catalysts, purification, etc.).
If you paste the WO number or the assignee name, the match can be made precisely.
What these synthesis patents usually cover (so you know what to look for)
Lesinurad synthesis (“manufacturing”) patents generally claim things like:
- Preparation of Lesinurad intermediates.
- Routes to the final active ingredient with defined reagents/conditions.
- Process steps that improve yield, purity, or scalability.
- Specific forms of intermediates (salts, protected groups) used during manufacturing.
How long a WO synthesis patent lasts (and why dates can differ)
If you mean “when does it expire,” timing depends on:
- The priority date (start of the patent term).
- Whether it entered national phase and where.
- Patent term adjustments or extensions in each country.
- Whether the patent is later invalidated, narrowed, or settled through litigation.
If you provide the WO number, you can determine the priority date and then estimate term/expiry by jurisdiction.
What happens if a synthesis patent expires (generic/manufacturing angle)
Even if a synthesis/process patent expires, branded or generic production may still be constrained by:
- Other composition-of-matter or formulation patents.
- Data exclusivity/regulatory protections.
- Trademarks/branding protections.
- Later process patents in the same family or improvements.
So the expiry of one WO “process/synthesis” patent may not fully remove manufacturing restrictions.
What I need from you to answer exactly
Please send one of the following:
- The WO publication number (e.g., WO 20xx/xxxxxx), or
- The full patent title, or
- The assignee/company name plus approximate year, or
- A link to the patent page.
Then I can tell you what that specific patent claims about Lesinurad synthesis and what its likely status/term implications are.