What patent is related to “hydroxyurea methyl carbamate hydroxylamine”?
The phrase you provided looks like a chemical-name fragment tied to patent literature, but it is not specific enough to identify a single patent record. Patent titles and compound names are often written with different ordering, synonyms, salt forms, or linkage wording (for example, “methyl carbamate” vs. “carbamic acid methyl ester,” and “hydroxylamine” written as “hydroxylamine hydrochloride” or “hydroxylamine salt”). With only this phrase, I can’t reliably match it to an exact publication number.
How to search the patent correctly (so you get the exact match)
To find the right patent, search using these strategies:
- Try variant spellings and ordering: combine “hydroxyurea” with “carbamate” and “hydroxylamine,” and also run searches using “hydroxylamine” plus “carbamate” without “hydroxyurea.”
- Use synonyms: “carbamate” may appear as “carbamic acid ester”; “hydroxylamine” may appear as “hydroxylamine hydrochloride” or “hydroxylamine salt.”
- Search by code words: many patents describe intermediates as “protected hydroxylamine” or “carbamate-protected hydroxylamine.”
- Use structure-based search if you have a drawing (Google Patents/Derwent and other tools may support this). If you paste a SMILES/InChI, results are much more precise.
Which patent databases usually surface this kind of chemistry?
If you want the actual publication, the most effective places are:
- Google Patents (broad synonym matching)
- Lens.org (structured filters and assignee lookups)
- USPTO / Espacenet (US and international publication records)
- Specialized chemical patent indexes (when available)
What I need from you to identify the exact patent
Send any one of the following and I can pinpoint the patent precisely:
- A patent number (US/WO/EP publication ID), or
- The assignee/company name, or
- The full chemical name as written in the patent (including any salt, e.g., hydrochloride), or
- A link/screenshot of where you saw the phrase, or
- The SMILES/InChI for the compound.
If your goal is freedom-to-operate: what to check besides the patent itself
Even after finding a relevant patent, practical clearance usually requires checking:
- Filing and publication dates (to know whether it’s active or expired)
- Claim scope (whether hydroxyurea itself is covered, or only a specific intermediate/protected derivative)
- Jurisdiction (US vs WO/EP can differ)
- Whether other related patents cover the same chemistry (common in multi-family filings)
Sources
No sources were provided in your prompt, so I can’t cite specific patent records yet.
If you paste the patent publication number (or the assignee name), I’ll return the exact patent identification and summarize what it claims about “hydroxyurea / methyl carbamate / hydroxylamine,” including likely scope and how to search for related family members.