What is Mesna (and what do people usually search in U.S. patents)?
Mesna is a drug used to prevent or reduce bladder damage caused by certain chemotherapy agents, especially ifosfamide and cyclophosphamide. Searches for “US patents mesna” usually mean one of two things: patents that claim a mesna-containing product/process, or patents that cite mesna as an ingredient or prior art in related therapies or drug-delivery technology.
How do U.S. “Mesna patents” typically work (drug vs. formulation vs. process)?
U.S. patents around mesna commonly fall into a few buckets:
- Formulation patents: specific ways to make or deliver mesna (for example, tablet/liquid formulations, stability improvements, or packaging).
- Process patents: manufacturing methods that change yield, purity, or cost.
- Combination/therapeutic patents: using mesna alongside a chemotherapy regimen or another agent to reduce toxicity.
- Drug-delivery patents: technologies that change how mesna is released or absorbed.
How can you find the exact U.S. mesna patents?
To locate the specific patents you want, the most direct approach is to search U.S. patent databases by keyword and assignee:
- Use “mesna” and related terms (for example, “mercaptoethanesulfonate” or “2-mercaptoethanesulfonate”) in the title/abstract fields.
- Add likely assignees (if you know the company) to narrow results.
- If you mean litigation or exclusivity, also search for “ANDA,” “Hatch-Waxman,” “paragraph IV,” or “Orange Book” entries tied to mesna products.
Are there mesna-related patents still active in the U.S.?
Whether a given mesna patent is still enforceable depends on its filing and issue dates, and whether any extensions apply. Many older drug-related patents have expired, but formulation or delivery patents can remain active longer. The only reliable way to answer “is it still active?” is to check each patent’s legal status in the USPTO records.
Do you mean patents for the drug product, or patents involving mesna for kidney/bladder protection?
People sometimes use “mesna” in patent searches because it’s referenced as a protective agent in other technologies (not only direct mesna products). If your goal is “mesna-specific,” narrow the search to claims that include mesna (or its chemical name) rather than papers or patents that merely mention it in the background.
Quick clarification so I can give the right patent list
When you say “Us patents mesna,” which of these do you want?
1) A list of U.S. patents that mention or claim mesna (and the key ones only), or
2) A specific company/product (tell me the company name or brand), or
3) Whether mesna patents are still active/expired for generic competition.
If you reply with (a) the brand or company you care about, or (b) whether you want “all mesna mentions” vs “mesna claimed,” I can narrow the results to the most relevant U.S. patents.