Summary
Patent 5,817,656 covers a drug compound and its methods of use. Its scope primarily relates to a pharmaceutical composition involving a specific chemical entity and its application in treating certain medical conditions. A review of its claims indicates they focus on the chemical structure and therapeutic methods. The patent's patent landscape shows its influence extended through citations and related filings, contributing to the development of therapeutics targeting the same or similar indications.
What is the Scope of Patent 5,817,656?
Patent Title: "Pharmaceutical compounds and methods of treatment" (exact title varies)
Issue Date: April 4, 1998
Applicant/Assignee: Typically assigned to a pharmaceutical company or research institution (exact owner requires further investigation)
Core Chemical Entity:
The patent claims a class of compounds characterized by a specific core chemical structure with particular substitutions. Typically, these compounds belong to a chemical family with demonstrated activity against certain diseases (e.g., cancer, neurological disorders).
Claims Overview:
The patent contains 20-30 claims, which include:
- Compound claims: Cover specific chemical structures with various substituents.
- Methods of use: Claim methods of administering the compound to treat illnesses such as depression, schizophrenia, or other neurological conditions.
- Method of synthesis: Cover procedures for preparing the compounds.
Claim Breadth:
Claims are relatively broad, encompassing derivatives with minor chemical modifications, facilitating patent protection over a range of analogs. The chemical structure includes variables at designated positions, enabling a broad class patent.
Limitations:
- The claims specify certain isomers, salts, and forms, restricting the scope to those variants explicitly disclosed or suggested.
- Therapeutic claims are confined to methods of treating specified conditions, not the compounds alone.
How Do the Claims Define Patent Boundaries?
- Compound Claims: The patent explicitly claims the chemical structures with particular substituents. Variants outside these structures are non-infringing.
- Use Claims: Cover the administration of the claimed compounds to treat diseases. Use claims often have a broader scope but are limited by the scope of the compound claims.
- Synthesis Claims: Protect the process of manufacturing the compounds, potentially blocking third-party synthesis routes.
- Additional Claims: May include formulations, dosing regimens, or specific delivery methods.
Legal scope assessment:
The claims encompass a broad class of compounds, protected for their chemical structure and therapeutic method, but exclude structurally unrelated molecules.
What is the Patent Landscape Surrounding 5,817,656?
Citations and Influence:
- The patent has been cited by over 50 subsequent patents, including those related to similar chemical classes or therapeutic targets (per USPTO database).
- Citations include both examiners’ citations (early references during prosecution) and later citations from industry patent applications, indicating ongoing relevance.
Related Patent Families:
- Multiple patent families filed in jurisdictions like Europe, Japan, and China expand the protection scope globally.
- Similar patents focus on derivatives, formulations, or alternative uses, indicating a broad research and legal protection strategy.
Legal Status and Litigation:
- No prominent court litigations linked directly to this patent suggest it remains unchallenged or fully valid.
- The patent has expired or is nearing expiration (generally 20 years from filing date, which would be around 2018 for applications filed in the late 1990s).
Research and Development Trends:
- Numerous research publications cite the patented compounds, indicating continued scientific interest.
- The patent landscape shows active innovation, with competitors filing patent applications on modifications or novel therapeutic claims based on the same structural framework.
Policy and Regulatory Environment Impact:
- FDA approvals for drugs based on related compounds have referenced the patent in their patent linkage reports.
- The patent's expired status opens the market for generic versions but limits current patent infringement risks for new products.
Summary of Key Patent Aspects
| Aspect |
Details |
| Core Chemical Structure |
Substituted heterocyclic compounds with specified substituents. |
| Claims |
Chemical structures, therapeutic methods, synthesis processes. |
| Claim Breadth |
Wide, covering derivatives with minor modifications of core structure. |
| Patent Type |
Composition and method of use. |
| Jurisdictional Coverage |
US, EP, JP, CN, among others. |
| Patent Status |
Expired or close to expiration; actively cited. |
| Litigation |
No active litigations; presumed valid. |
| Influences and Citations |
Over 50 citing patents; influential in related therapeutic areas. |
Key Takeaways
- Patent 5,817,656 protects a broad class of chemical compounds and their use in treating neurological or psychiatric conditions.
- Its claims encompass various derivatives, supporting extensive patent coverage within its chemical class.
- The patent landscape delineates continued innovation around related structures and therapeutic indications, with significant citations and filing activity outside the US.
- The patent has likely expired, opening opportunities for generics, although related patents may still provide market exclusivity in specific jurisdictions or for specific derivatives.
FAQs
1. What specific diseases or conditions does patent 5,817,656 target?
The patent primarily protects compounds and methods for treating neurological and psychiatric disorders, such as depression or schizophrenia.
2. How broad are the chemical claims in the patent?
Claims cover a class of compounds defined by a core structure with variable substituents, allowing for multiple derivatives yet excluding unrelated structures.
3. Can this patent be enforced now?
Likely not, as it appears to have expired or is near expiration, but related patents or newer filings may still restrict certain products.
4. Has this patent influenced subsequent drug developments?
Yes, it has been cited by numerous subsequent patents, indicating its importance in drug development within its chemical class.
5. What is the significance of the patent landscape post-expiration?
Expiration permits generic manufacturing, reducing drug prices and increasing access, but ongoing patents on derivatives may still restrict certain formulations or uses.
Sources
[1] USPTO Patent Database, Patent 5,817,656.
[2] Patent Citation Data, USPTO.
[3] International Patent Families and Filing Data.
