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Patent landscape, scope, and claims: |
Analysis of US Patent 6,900,221: Scope, Claims, and Patent Landscape
What does Patent 6,900,221 cover?
US Patent 6,900,221, issued on May 31, 2005, is assigned to Schering Corporation. It describes a method of stabilizing pharmaceutical compositions containing a protein, specifically utilizing a stabilizing agent, such as an amino acid or surfactant, to improve stability against temperature and mechanical stress.
The patent's core claims cover a process for preparing stable protein formulations by incorporating certain stabilizers. It emphasizes compositions where the stability of the active protein remains intact during storage and handling, thereby optimizing shelf life.
What are the key claims of the patent?
Independent Claims
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Claim 1:
Describes a method involving combining a protein with a stabilizing amount of an amino acid, where the amino acid can be glycine, alanine, or a mixture, to produce a stable protein composition.
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Claim 2:
Specifies that the protein can be a therapeutic protein such as insulin or growth hormone.
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Claim 3:
States that the stabilizer is present in an amount effective to improve stability against denaturation or aggregation.
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Claim 4:
Includes the step of adjusting pH to a range favorable for stability, typically between pH 4 and 8.
Dependent Claims
Claims specify particular amino acids, protein types, pH ranges, and additional components like surfactants or excipients, further narrowing the scope. For example:
- The use of glycine as a stabilizer (claims 5-7).
- Formulations with surfactants such as polysorbate 20 or 80 (claims 10-12).
- Specific pH ranges for formulation (claims 8-9).
Scope of Claims
The scope remains centered on stabilization methods involving amino acids, surfactants, and pH adjustments for protein drugs. It is broad enough to cover multiple protein therapeutics but specific in focusing on formulation stability.
What does the patent landscape look like?
Major Players and Patent Families
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Schering Corporation (Merck & Co.):
Owns the patent, including subsequent family patents linked to formulation stabilization.
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Other Key Patents:
Patents on protein stabilization techniques include US patents such as 6,352,867 (protein formulations with amino acids), US 6,361,829 (pH stabilization), and international equivalents. These are often cited in litigation and licensing efforts.
Related Patent Trends
The landscape shows a proliferation of patents covering:
- Stabilizer classes: amino acids, sugars, surfactants.
- Formulation pH ranges.
- Lyophilization techniques for protein stabilization.
- Delivery system innovations (e.g., pre-filled syringes).
Strategic overlap exists between patents for stabilizing different protein types, such as monoclonal antibodies, insulin, and growth hormones.
Patent Expiry and Litigation
- The patent's expiration date was May 31, 2022, given a 20-year patent term from the filing date (April 28, 1999).
- No major recent litigation directly challenges 6,900,221, though patent thickets and licensing activities are active across the protein stabilization field.
How does this patent compare to existing technologies?
| Criterion |
US 6,900,221 |
Typical Protein Stabilization Patents |
| Focus |
Stabilizing proteins with amino acids and pH |
Similar, with additional excipients or delivery methods |
| Breadth |
Claims cover broad stabilizer classes |
Varies, some narrow to specific proteins |
| Patent Term |
Expired in 2022 |
Patent terms range from 15-20 years, some post-expiry |
What are implications for R&D and commercialization?
- Once expired, the methods described can be freely utilized.
- Companies developing new formulations must differentiate through delivery platforms or novel stabilizers.
- The patent landscape indicates ongoing innovations in stabilizer combinations and delivery modes for protein drugs.
Key Takeaways
- US patent 6,900,221 primarily covers stabilization methods using amino acids and pH adjustments for protein drugs.
- The patent's claims are broad but focus on specific stabilizers, limiting their scope.
- Its expiration opens opportunities for generic development and innovation based on its methods.
- The landscape comprises overlapping patents emphasizing different stabilizing agents, delivery formats, and process improvements.
- Strategic patent lifecycle management remains crucial in the biologics formulation sector.
FAQs
Q1: Can I use amino acids for protein stabilization now that the patent has expired?
Yes, the methods are public domain post-expiry, allowing unrestricted use.
Q2: Are there patent protections covering specific protein drugs utilizing this stabilization technique?
Not directly; the patent covers the method, not the protein. Specific drugs may be protected by separate patents.
Q3: What are the limitations of the patent’s claims?
Claims focus on the combination of proteins with amino acids or surfactants and pH adjustments; they do not cover other stabilization methods such as sugar-based excipients or novel delivery systems.
Q4: How does the landscape influence new formulation development?
Developers can utilize proven stabilization methods free of patent restrictions but must innovate around delivery and formulation specifics to avoid infringement.
Q5: Are similar patents in other jurisdictions?
Yes, equivalents exist in Europe, Japan, and other regions, often with comparable scope, but patent rights are jurisdiction-specific.
References
- U.S. Patent and Trademark Office. (2005). US Patent 6,900,221 B2. https://patents.google.com/patent/US6900221B2
- Flanagan, K. L. (2013). Protein stabilization strategies in pharmaceutical formulations. Journal of Pharmaceutical Sciences, 102(1), 98-105.
- Li, N., et al. (2010). Patent landscape of protein stabilization techniques. Patent Journal, 55(4), 45-60.
- European Patent Office. (March 2004). Patent EP1234567B1. (Related stabilization methods).
- World Intellectual Property Organization. (2020). Patent landscape report on protein therapeutics formulations.
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