What is rolapitant, and what does a “synthesis patent” cover?
Rolapitant is an oral NK1 (neurokinin-1) receptor antagonist used to prevent chemotherapy-induced nausea and vomiting (CINV). A “synthesis patent” for rolapitant typically refers to intellectual property covering how to make the compound—such as specific chemical reaction routes, intermediates, catalysts/conditions, purification steps, and related process parameters—rather than patents that only cover the drug molecule itself (composition-of-matter).
Where to look for rolapitant process/synthesis patents (“wo”)
The “wo” most often means a WO publication (a Patent Cooperation Treaty, or PCT, application published by WIPO). To find rolapitant synthesis patents in WO format, search patent databases for:
- “rolapitant” AND “process”
- “rolapitant” AND “preparation”
- “rolapitant” AND “intermediate”
- “rolapitant” AND “WO”
- IPC/CPC classes relevant to small-molecule synthesis (varies by system)
These searches usually surface WO documents that later enter national phases (US/EU/JP/CN/KR, etc.).
How to tell if a rolapitant patent is really about synthesis (not just formulation)
When you open a candidate WO document, synthesis/process patents usually emphasize:
- “Process for preparing” / “method for producing”
- named intermediates with defined structures
- reaction steps (reagents, temperatures, solvents, stoichiometry, yields)
- purification or crystallization steps tied to the process
Molecule-only patents often focus on:
- “compound” or “pharmaceutical composition containing...”
- dosage forms/excipients
- therapeutic use claims
How long a synthesis patent stays in force (and what affects that)
Patent term commonly runs up to 20 years from the earliest effective filing date, but the effective lifespan can change due to:
- whether the application entered national phase and where it was granted
- patent term adjustments/extension regimes in each jurisdiction
- whether maintenance fees were paid
- any litigation, invalidation, or consent judgments
For WO documents, the key is the priority date inside the record, then the jurisdictions where it actually granted.
If you mean “wo” as in a specific document number
If you paste the WO number (for example, “WO20xx/xxxxx”), I can help you interpret what it covers—whether it’s a synthesis/process patent, what claims likely protect, and how it relates to rolapitant generally.
What I need from you to answer precisely
Right now the query is too short to identify the exact WO document or even the specific patent family. Share one of the following:
1) the WO publication number, or
2) the applicant/assignee name, or
3) a link/title/abstract text from the WO record, or
4) the priority year (and any snippet like “process for preparing rolapitant”).
Then I can give a targeted explanation of the rolapitant synthesis patent and what it protects.
Sources
No sources were provided in your message, and I don’t have the WO identifier to look up the right record.