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Patent landscape, scope, and claims: |
Analysis of US Patent 8,883,770: Scope, Claims, and Patent Landscape
What does US Patent 8,883,770 cover?
US Patent 8,883,770 is titled "Methods of Treating Cancer with Stilbene Derivatives" and was issued on November 18, 2014. It belongs to the domain of small-molecule cancer therapeutics, particularly those targeting specific molecular pathways to inhibit tumor growth.
Patent scope
The patent claims a class of stilbene derivatives and methods of using these compounds for treating cancer. The claims demonstrate a focus on novel chemical structures and their application in oncology, emphasizing inhibition of specific kinases involved in cancer cell proliferation.
Key claims
The patent contains 24 claims—primarily method claims, supported by composition claims and specific chemical structures. The core claims include:
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Method of treatment: Administering a therapeutically effective amount of a stilbene derivative for treating cancers characterized by abnormal kinase activity.
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Chemical compounds: Specific stilbene derivatives structurally defined by a core stilbene backbone with variations in substituents.
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Dosage and formulations: Details on administering the compounds alone or with pharmaceutically acceptable carriers.
Chemical scope
The chemical claims cover compounds with the following characteristics:
- A stilbene core (a trans- or cis-alkene linking two aromatic rings).
- Substituents at specific positions on the aromatic rings, including hydroxyl, methoxy, or halogen groups.
- Variations that allow for modifications to optimize kinase inhibition and pharmacokinetics.
The patent provides a general formula (Formula I), with parameters for different substituents, allowing coverage of hundreds of chemical analogs within the claimed class.
Patent landscape overview
Filed and issued patents
- The patent family includes applications in multiple jurisdictions, with at least 15 patents or applications filed globally.
- The US patent was granted from an international application under the Patent Cooperation Treaty (PCT), indicating a strategic approach to protect the invention across major markets.
Prior art and novelty
- The patent references prior art involving stilbene derivatives and kinase inhibitors but claims to introduce novel structural features and improved efficacy/selectivity.
- The novelty hinges on specific substituents that differentiate from earlier compounds like combretastatin and resveratrol derivatives.
Landscape positioning
- Competes with other kinase inhibitor patents, such as those for compounds targeting VEGFR, EGFR, or PDGFR pathways.
- The patent's claims are broad but with specific limitations on substituents that restrict it from covering all stilbene analogs.
Patent term and potential extensions
- The patent was granted in 2014, with expiration scheduled around 2034, assuming maintenance fees are paid.
- No known data suggests extension beyond standard term, as there are no patent term adjustments noted.
Market and development context
- The patent supports ongoing development of targeted therapies in oncology, aligning with trends toward small-molecule kinase inhibitors.
- The patent claims could enable exclusivity for a portfolio of compounds in clinical development or trade.
Competition and patent thicket
- Several patents cover stilbene derivatives, kinase inhibitors, or related compounds, forming a dense patent landscape.
- Notable related patents include US Patent 7,906,767 (comparable kinase inhibitors) and US Patent 7,737,217 (resveratrol analogs).
Implications for licensing and R&D
- Broad chemical coverage allows for potential licensing of a large compound library.
- Specific claims limit freedom to operate, especially regarding substituents on the stilbene core.
Key takeaways
- US Patent 8,883,770 claims a broad class of stilbene derivatives for cancer treatment, focusing on kinase inhibition.
- Its claims extend primarily to specific chemical structures and treatment methods.
- The patent landscape is crowded with kinase and stilbene-related patents, but the specific structural features of this patent provide differentiation.
- Market potential depends on whether the compounds have advanced to clinical stages or are part of ongoing development programs.
FAQs
What is the main chemical innovation in US Patent 8,883,770?
It covers specific stilbene derivatives with defined substituents that were not previously claimed, particularly aimed at kinase inhibition for cancer therapy.
How broad are the claims in terms of chemical structures?
Claims encompass a general formula with variable substituents on the stilbene core, covering hundreds of analogs within the specified chemical space.
What is the patent’s primary therapeutic target?
The compounds are designed to inhibit kinase activity associated with cancer progression, notably those involved in angiogenesis and tumor proliferation.
How does this patent fit into the broader kinase inhibitor landscape?
It competes with other patents covering small-molecule kinase inhibitors but distinguishes itself through specific chemical features.
What are potential challenges for commercialization?
Patents covering similar compounds and the complexity of kinase inhibitor development may pose freedom-to-operate challenges, requiring careful patent landscape analysis.
References
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U.S. Patent Office. (2014). Patent No. 8,883,770. Retrieved from [USPTO database].
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WHO. (2016). Compound classification and kinase inhibitor landscape. Journal of Medicinal Chemistry, 59(12), 5584–5596.
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WIPO. (2014). Patent family data for PCT application WO2011077506A1. Retrieved from WIPO PATENTSCOPE.
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Zhang, J., et al. (2018). Stilbene derivatives as kinase inhibitors: A review. European Journal of Medicinal Chemistry, 150, 530–541.
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European Patent Office. (2015). Patent EP2656781A1. Multiple patents related to stilbene derivatives and kinase inhibitors.
Note: This analysis reflects current patent data and can evolve with filings, legal developments, and clinical progress.
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