What is a rolapitant synthesis patent?
A “rolapitant synthesis patent” is a patent that claims one or more steps (or a full route) to manufacture rolapitant, a neurokinin-1 (NK1) receptor antagonist used as an antiemetic. Such patents typically cover specific chemical transformations, reagents, intermediates, catalysts, purification steps, or crystallization/solvate forms used to make rolapitant.
Who holds rolapitant synthesis patents?
Patent ownership can vary by jurisdiction and by invention scope (for example, one company may own a process patent for making an intermediate, while another may own a final product manufacturing process). To identify the right owner(s), you generally need the patent number, application number, or assignee name you’re looking at.
If you share any of the following, I can help pinpoint the most relevant synthesis-related filings:
- Patent publication number (WO/EP/US/JP, etc.)
- Assignee/company name
- An intermediate name (if known)
- A link or screenshot of the patent document you found
How long does a rolapitant synthesis patent last?
Process/synthesis patents usually follow standard patent term rules (often up to 20 years from the earliest effective filing date, subject to local laws and any adjustments). Exact expiration dates depend on the priority date and the country/regional filing.
Are there multiple patents covering rolapitant manufacturing?
Yes. Rolapitant’s manufacturing can be protected by different layers, such as:
- Methods to make key intermediates
- Methods to couple/functionalize specific parts of the molecule
- Purification, crystallization, or salt/solvate formation steps
- Specific reaction conditions (solvents, temperatures, catalysts, pressures)
- Scale-up or yield improvement variants
So a “synthesis patent” search often turns up a family of related filings rather than one single patent.
How do you find rolapitant synthesis patents effectively?
For search intent like yours, the most effective approach is to search by a mix of:
- “rolapitant” + “process” / “manufacture” / “preparation” / “synthesis”
- “rolapitant” + “intermediate”
- Names of known chemical fragments or intermediates (if you have them)
- Patent family identifiers (priority application numbers) once you find one strong match
What if a synthesis patent is expired—can generics be made freely?
If a particular synthesis/process patent is expired (or doesn’t apply to the method used), then the manufacturing method may be available, but other restrictions can still apply, such as:
- Other still-active patents on different intermediates or steps
- Patents covering specific polymorphs/solvates
- Regulatory exclusivities (separate from patent rights)
- Background IP around related NK1 antagonists or formulation steps
What I need from you to answer with specific patent details
Right now, “Rolapitant synthesis patent” is too broad to name the exact documents and claims. If you provide any one of these, I can give a targeted answer (publication/assignee, priority dates, claims summary focused on synthesis, and likely remaining term):
- A patent publication number (e.g., WO… / US… / EP…)
- The assignee name you suspect
- A URL to the patent record
- The intermediate name or any claim snippet you saw
Sources
No sources were provided in the prompt.