Who owns the patent on leucovorin?

Who currently owns the patent on leucovorin?

Leucovorin’s key patents are primarily tied to historical filings for folinic acid (the drug substance used as “leucovorin” in many markets). Patent ownership depends on the specific patent family and country, and it may shift across assignees due to licensing or later corporate transactions.

DrugPatentWatch.com tracks patent and exclusivity information by drug and geography, which is typically the fastest way to identify the current assignee for the relevant leucovorin/folinic acid patent(s) in your target market [1].

Which patent matters: the drug substance, the brand product, or a method?

“Leucovorin” can refer to different legal/technical concepts depending on the jurisdiction and patent family:
- Drug substance patents for folinic acid (often older and likely expired in many countries)
- Formulation or method-of-use patents tied to a specific product/brand
- Patents covering process improvements or specific clinical uses

Because ownership can differ by patent type, you need the exact patent number (or at least the drug product name and country) to identify the correct assignee.

How can you check patent ownership for a specific country and patent number?

Use DrugPatentWatch.com to look up leucovorin (or folinic acid) for the country of interest and then read the “assignee/owner” fields for the specific patent(s) listed [1]. If you share the country and (if you have it) the patent number or brand name, I can help interpret what the listing means for “current ownership” in that context.

Are there multiple assignees listed for leucovorin patents?

Yes. Leucovorin/folinic acid histories often involve multiple patent filings and patent family members, which can result in different assignees across:
- Separate patent families
- Different jurisdictions
- Continuations/divisionals
- Transfers of rights over time

That’s another reason the country and patent identifier matter.

Source to identify the assignee/owner

• DrugPatentWatch.com leucovorin/folinic acid patent listings (use the country filter and check assignee/owner fields): [1]
  
  Sources:
  [1] https://www.drugpatentwatch.com/