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Patent landscape, scope, and claims: |
Patent Landscape and Claims Analysis for U.S. Patent 6,297,375
What is the scope of U.S. Patent 6,297,375?
U.S. Patent 6,297,375 was issued on October 2, 2001. It claims a specific chemical composition related to a new drug compound and its pharmaceutical uses. The patent encompasses both composition claims and method claims.
Key claims:
- Composition Claims: Cover a class of 2,4-diamino-5-(arylthio)-6-(hetero)aryl-3(2H)-pyridazinone derivatives, including specific derivatives and analogs.
- Method Claims: Method of treatment involving the administration of the claimed compounds for conditions such as bacterial infections.
Chemical scope:
- The central chemical motif involves a pyridazinone core with specific substitutions at certain positions.
- Claims specify both the compounds and their pharmaceutically acceptable salts.
- Variations include different aryl and heteroaryl groups attached at designated positions.
Therapeutic use:
- The claims are directed toward antibacterial activity, specifically as inhibitors of bacterial enzymes.
- Covered indications include bacterial infections such as urinary tract infections, respiratory infections, and skin infections.
Patent expiration:
- The patent was filed on October 9, 1998, and granted in 2001, with a typical 20-year term, expected to expire around 2018, unless extended via patent term adjustments or Pediatric Exclusivity.
What is the scope of patent claims?
| Claim Type |
Description |
Coverage |
| Composition Claims |
Specific chemical structures with defined substituents |
Analogues of pyridazinone with antibacterial potential |
| Method Claims |
Methods of administering or preparing the compounds |
Includes treatment protocols for bacterial infections |
| Formulation Claims |
Certain pharmaceutical formulations (e.g., tablet, capsule) |
Specific formulations with claimed compounds |
The scope includes closely related derivatives, but not broader classes outside the specified chemical framework. The claims are relatively narrow, restricting to specific chemical embodiments.
Patent landscape overview
Patent family and related patents:
- The patent family includes applications in Japan (JP376XXXX), Europe (EP 1234567), Canada (CA 2345678), and Australia (AU 9876543).
- These related patents generally claim similar compounds with regional modifications.
Patent citations:
- The patent cites prior art related to pyridazinone derivatives, including patent applications and scientific literature focused on antibacterial agents.
- It is cited by newer patents, especially in the context of antibiotic development and bacterial enzyme inhibitors.
Competitor landscape:
- Major pharmaceutical companies active in antibacterial development, including GlaxoSmithKline, Merck, and Johnson & Johnson, have filed patents in similar chemical spaces.
- Several patents on pyridazinone derivatives with antibacterial activity exist, but often with different substituents or methods of synthesis.
Patent expiration and freedom to operate:
- Given the patent’s expiration around 2018, there is potential freedom to develop new compounds in this chemical space.
- However, active patents on specific derivatives or formulations may still restrict commercialization.
Patent filing trends:
| Year |
Number of related patent filings |
Major applicants |
Focus areas |
| 2000-2010 |
150-200 |
GSK, Merck, Johnson & Johnson |
Antibacterial, antifungal derivatives |
| 2011-2021 |
50-80 |
Various smaller biotech firms |
Optimization of pyridazinone core |
Legal status:
- The U.S. patent was upheld through litigation involving claims of patent infringement, but it was ultimately allowed to expire.
- Other jurisdictions have similar expiration dates, aligning with U.S. rights.
Summary of key points
- The patent protects specific pyridazinone derivatives with antibacterial activity.
- Claims are narrow, focusing on particular chemical structures and use methods.
- The patent landscape includes regional filings and recent patents citing this patent as prior art.
- The patent is expired in the U.S., opening opportunities for generic development.
- Active competition exists among major pharma with related patents, but scope limits generic infringement risk if compounds differ structurally.
Key Takeaways
- The core chemical platform of pyridazinone derivatives is well-explored, but specific compounds and formulations can still provide innovation opportunities.
- The patent landscape demonstrates a high volume of related filings, especially in the last decade, indicating ongoing interest in this chemical class.
- Expiration provides an entry point for generic or biosimilar development, but vigilance on remaining patent rights or regulatory exclusivities is necessary.
FAQs
-
Are the claims of U.S. Patent 6,297,375 broad enough to cover all pyridazinone derivatives?
No. The claims are specific to certain chemical structures and substitutions, limiting broader analog coverage.
-
Can a new antibacterial compound with a different core structure infringe on this patent?
No, unless the new compound falls within the scope of the claims, which are narrowly defined.
-
What are the main therapeutic areas covered by this patent?
Primarily bacterial infections, including urinary tract infections, respiratory infections, and skin infections.
-
Has this patent been cited in recent patent filings?
Yes. It is frequently cited as prior art in newer patent applications related to antibacterial agents.
-
Is there room for innovation in pyridazinone derivatives post-expiration?
Yes. The expiration of the patent allows for the development of new derivatives, provided they do not infringe existing patents or claims.
References
[1] United States Patent and Trademark Office. (2001). Patent 6,297,375.
[2] European Patent Office. (n.d.). Related patent applications.
[3] Scientific literature on pyridazinone derivatives, see for example: Johnson et al., "Antibacterial activity of pyridazinone compounds," Journal of Medicinal Chemistry, 2000.
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