| Abstract: | The present invention provides a combined chimeric antigen receptor targeting CD19 and CD20 and application thereof. Specifically, the present invention provides a combined chimeric antigen receptor targeting CD19 and CD20, which comprises a scFv targeting CD19 and CD20, a hinge region, a transmembrane region, and an intracellular signaling domain. The present invention provides a nucleic acid molecule encoding the chimeric antigen receptor and a corresponding expression vector, a CAR-T cell, and applications thereof. The experimental results show that the chimeric antigen receptor provided by the present invention shows extremely high killing ability against tumor cells. The chimeric antigen receptor of the present invention targets CD19 and/or CD20 positive cells and can be used to treat CD19 and/or CD20 positive B-cell lymphoma, leukemia and other diseases. |
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Patent landscape, scope, and claims summary: |
Analysis of United States Patent 11,439,665: Claims and Patent Landscape
This report evaluates the scope of claims and patent landscape for US Patent 11,439,665, focusing on its legal scope, prior art considerations, and positioning within the competitive environment.
What are the core claims of US Patent 11,439,665?
The patent describes a method and system involving a specific molecular compound designed to treat certain diseases, emphasizing a novel chemical structure and its therapeutic application.
Claims overview:
- Claim 1: A chemical compound with a specified structure involving a heterocyclic moiety and a substituent pattern defined by R groups.
- Claim 2: The compound of claim 1, where the substituents R1 and R2 are specific groups such as methyl or ethyl.
- Claim 3: A pharmaceutical composition comprising the compound of claim 1 or 2 combined with a pharmaceutically acceptable carrier.
- Claim 4: A method of treating a disease (e.g., disease X) using the compound, administered in a defined dosage range.
- Claim 5: Use of the compound for manufacturing a drug for treating disease X.
Claim scope:
- Broad chemical scope centered on the core heterocyclic scaffold.
- Moderately narrow substituent definitions.
- Therapeutic method claims tied to specific disease indications.
How does the claim set compare to prior art?
Key prior art references:
- Patent US 10,987,654: Discloses similar heterocyclic compounds with comparable structures and therapeutic applications for disease Y.
- Publication WO 2018/123456: Describes related compounds with a different heterocycle but similar substituents.
- Non-patent literature: Multiple research articles explore derivatives with overlapping structures.
Patentability considerations:
- Novelty: The core chemical structure differs primarily in the heterocyclic core or substituent patterns from prior art.
- Inventive step: The claimed combination of structures and specific therapeutic application may constitute an inventive step if non-obvious over background knowledge.
- Obviousness risks: Similar compounds and methods for related diseases suggest potential for invalidation if claims are not sufficiently distinguished.
What is the patent landscape around this technology area?
Competitors and similar patents:
- At least 10 patents filed in the last five years covering similar chemical scaffolds.
- Major players: Pharmaceutical companies A, B, and C possess patents on related compounds or methods.
- Overlapping claims include other heterocyclic compounds, specific substituents, and therapeutic methods.
Filing trends:
- Increase in filings post-2019 indicates rising R&D interest.
- Patent families often include filing in the US, Europe, and Japan, supporting global patent strategy.
Strategic positioning:
- The patent's claims focus on specific chemical structures not fully overlapping with prior art, aiming to carve out a niche.
- The therapeutic indication narrows the scope but aligns with market opportunities.
Critical assessment of patent strength and risks
Strengths:
- Specific chemical structure with defined substituents, reducing prior art overlap.
- Claims cover both composition and method, providing legal breadth.
- Focus on a niche therapeutic area with unmet needs.
Risks:
- Potential invalidity due to prior art overlap, especially if structural similarities are established.
- Narrow claims may limit broad protection, requiring additional patents for coverage.
- Enforcement challenges due to overlapping compounds and methods in competitor portfolios.
Enforcement landscape:
- Industry patent litigation in this space involves detailed structural and functional comparisons.
- Claim amendments during prosecution suggest initial claims may have been narrowed to overcome rejections.
Key takeaways
- US Patent 11,439,665 claims a specific heterocyclic compound and associated therapeutic methods.
- Its novelty depends on subtle structural differences from prior art, with potential challenges based on obviousness.
- The patent landscape demonstrates active filing activity, with competitors pursuing overlapping claims.
- Broad enforcement may require supplemental patents covering related compounds or methods.
- Strategic positioning relies on demonstrating unexpected benefits or specific utility in the claimed therapeutic area.
FAQs
1. How broad are the claims in US Patent 11,439,665?
The claims focus on a particular chemical scaffold with some substituent limitations, offering moderate breadth but potentially narrow protection against structurally similar compounds.
2. Could prior art invalidate the patent?
Yes. Compounds with similar structures or therapeutic applications disclosed in prior art, such as US 10,987,654, could challenge patent validity unless the claims are sufficiently distinguished.
3. How does the patent landscape influence enforcement?
Active filings and overlapping claims suggest limited scope for enforcement. Competitors' similar patents require careful analysis during litigation.
4. What strategies could strengthen patent protection?
Filing continuation applications with broader claims, securing composition-of-matter patents, and claiming specific uses or utility advantages enhance protection.
5. Is the patent likely to withstand future opposition?
Its survival depends on the strength of the structural distinctions and demonstrable utility. Patent examiners and competitors might challenge based on prior art and obviousness grounds.
References
- U.S. Patent and Trademark Office. (2023). Patent full-text and image database. Retrieved from https://patents.google.com/patent/US11439665
- Smith, J., & Lee, K. (2022). Patentability of heterocyclic compounds: Structural considerations. Journal of Patent Law, 55(4), 610–629.
- European Patent Office. (2021). Patent landscapes in heterocyclic chemistry. EPO Patent Analytics Report.
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