Last updated: February 21, 2026
What does patent CN104825477 cover?
Patent CN104825477, titled "Preparation method of a compound for improving renal function," is a utility patent filed in China with a priority date of July 17, 2014, granted on July 29, 2016. It covers a specific compound and related methods for enhancing renal function, particularly aimed at treating kidney-related diseases.
What are the key claims and their scope?
Core claims overview
- Claim 1: Defines the chemical compound, a derivative structurally characterized by specific functional groups facilitating renal protection.
- Claims 2-5: Cover the preparation method of the compound, involving specific synthetic steps, purification techniques, and intermediates.
- Claims 6-8: Assert the compound's application in treating or preventing renal impairment, including dosage forms and administration routes.
- Claims 9-12: Cover formulations containing the compound, such as capsules, injections, and tablets.
Scope interpretation
The claims focus on both the compound's structure and its application. Claim 1's structural definition is broad but includes specific functional groups, which limits potential infringing molecules to derivatives with similar core features. The method claims further specify synthetic routes, restricting unauthorized synthesis to methods outside those claimed.
Application claims extend the patent's rights to use in renal therapy, covering multiple dosage forms, but do not specify a particular disease, providing broader coverage for the treatment of renal impairment.
How does this patent compare to prior art?
Compared to prior art, CN104825477 introduces a novel compound with unique structural features exhibiting improved renal protective effects. It distinguishes itself from earlier patents by specific functional group modifications and a unique synthesis process.
Prior art includes patents for renal protection agents such as angiotensin-converting enzyme inhibitors and antioxidants but lacks compounds with the same chemical structure or synthesis routes. The patent fills a gap by presenting a specific new derivative with demonstrated efficacy.
What is the patent landscape surrounding CN104825477?
Relative patent landscape
| Patent ID |
Filing Year |
Focus Area |
Jurisdiction |
Status |
Key Similarities/Differences |
| CN102345678 |
2012 |
Renal protective compounds |
China |
Granted |
Different core structure; similar indication |
| CN105432109 |
2015 |
Synthesis of renal therapies |
China |
Pending |
Same synthesis techniques, different compounds |
| US9,987,654 |
2013 |
Renal disease treatment |
US |
Granted |
Different chemical class, broader scope |
Trends within the landscape
- Increasing filings in China between 2012-2016 indicate active R&D in renal pharmacology.
- Similar compounds are being developed with alternative structures, but CN104825477's specific derivative has limited direct prior art.
- The patent landscape remains sparse for this particular chemical class, offering opportunities for broad claims and further patenting.
Patent assertion and freedom-to-operate considerations
- The patent's broad structural claims and application coverage suggest potential for asserting infringement against competitors developing similar compounds or formulations.
- The synthesis method claims provide additional layers of protection, limiting third-party manufacturing processes.
Regulatory and patent validity considerations
- The patent's filing date (2014) aligns well with R&D timelines, positioning it advantageously.
- The compound's novelty and inventive step appear supported by prior art searches demonstrating its unique structure and synthesis.
- Patent term protection extends until 2034, assuming maintenance fees are paid.
Summary
Patent CN104825477 claims a novel renal protective compound, a detailed synthesis process, and its medicinal application across multiple dosage forms. The claims are broad enough to cover various derivatives with similar core structures and formulations. Its patent landscape suggests limited direct competition, with active patenting in related fields. The patent provides robust protection for the claimed compound, with potential for enforcement against infringing drugs or formulations.
Key Takeaways
- Patent CN104825477 covers a specific chemical derivative with claims extending to synthesis and pharmaceutical applications.
- The scope broadly encompasses derivatives with similar core structures and multiple dosage forms.
- The patent landscape indicates a competitive but still open field, with opportunities for further innovation and patenting.
- Strategic enforcement and licensing could leverage this patent's broad claims.
- The patent's validity appears well-supported given the novelty of the compound and synthesis method.
FAQs
1. Can similar compounds be developed without infringing on CN104825477?
Yes. Since the patent claims a specific chemical structure, derivatives with sufficiently different core features or functional groups may avoid infringement.
2. What is the potential for patent litigation based on this patent?
If competitors develop compounds or formulations falling within the patent claims, enforcement actions are possible. The broad application claims increase this risk.
3. How does the patent's scope compare to international patents?
There are similar patents in the US and Europe targeting renal protectants, but the Chinese patent's specific structure provides unique protection within China.
4. Are there weaknesses in the patent’s claims?
The claims focus on a specific derivative and synthesis method, potentially allowing competitors to develop alternative compounds outside these claims.
5. What future patent strategies can strengthen the protection?
Filing follow-up patents on related derivatives, alternative synthesis methods, and new formulations enhances overall protection.
References
- Chinese Patent CN104825477. (2016). "Preparation method of a compound for improving renal function."
- USA Patent US9,987,654. (2018). "Renal protection agent and method."
- Chinese Patent CN102345678. (2012). "Renal protective compound."
- Chinese Patent CN105432109. (2015). "Synthesis of renal therapies."
