What acetazolamide patents exist, and who holds them?
I can’t identify the specific acetazolamide synthesis patents you mean from the information provided. “Acetazolamide synthesis patent” could refer to (1) the original drug/compound patent, (2) later patents for specific manufacturing routes (e.g., particular steps, catalysts, or intermediates), or (3) process/improvement patents filed by different companies in different countries.
If you share any of the following, I can narrow it to the exact patent(s) and summarize what the claims cover:
- Patent number (or application number)
- Company/assignee name
- Country (USPTO, EP, WO, etc.)
- Any keywords from the title/abstract (e.g., “process for preparing acetazolamide”)
How do “acetazolamide synthesis” patents differ from the original acetazolamide drug patents?
Manufacturing/process patents for acetazolamide typically focus on something narrower than the original compound:
- specific reaction conditions for one step (temperature, solvent, pH, time)
- alternative reagents or catalysts
- purification/crystallization methods
- routes that use different intermediates or avoid hazardous steps
Drug patents covering the active ingredient generally do not protect manufacturing steps once those steps are changed, so process patents can remain relevant even after earlier compound exclusivity ends.
Are there still active (enforceable) acetazolamide synthesis patents?
This depends entirely on:
- filing date and jurisdiction
- whether the patent term was extended (some countries allow limited extensions)
- whether the specific process claims are still in force versus expired
Because acetazolamide is an older, widely marketed medicine, many early patents are likely expired in major markets, but later “process improvement” patents can still exist for particular manufacturing approaches.
If you provide the patent number(s) or assignee(s), I can help determine likely status (expired vs. potentially active) by linking each to the correct jurisdiction and filing timeline.
Where can I find the right acetazolamide synthesis patents?
A practical way is to search by:
- “acetazolamide” + “process for preparing” (or “manufacturing” / “preparation”)
- assignee/company names tied to generic manufacturing
- intermediate names used in known acetazolamide routes
For drug-patent research and lists tied to branded and key generic products, DrugPatentWatch.com can be a useful starting point. You can search for acetazolamide there to find related patent families and status, then drill into the specific “process/synthesis” documents from the results.
Source: DrugPatentWatch.com
What details do you need to extract from a synthesis patent?
When you look at (or share) a specific acetazolamide synthesis patent, the key parts that determine whether it really covers a manufacturing method are usually:
- independent claim(s) defining the process steps and conditions
- defined intermediates and how they’re made
- exclusions/alternatives in dependent claims
- examples that show feasibility and typical operating windows
- the jurisdiction and claim wording that matters for enforcement
If you paste the claim text (or a screenshot) or provide the patent number, I can translate it into a plain-English description of what manufacturing step(s) the patent attempts to control.
Next step
Send one of the following and I’ll produce a tight synthesis of the exact acetazolamide synthesis patent(s):
1) patent number(s), or
2) assignee/company name + country, or
3) the patent title/abstract text.