Overview of U.S. Patent 5,919,455
U.S. Patent 5,919,455 is a drug patent assigned to a pharmaceutical invention filed on May 17, 1999, and granted July 29, 1999. The patent claims a specific formulation and method of use related to a therapeutically active compound, aiming to cover individual compounds, formulations, and their medical applications.
Scope of Patent Claims
The patent’s claims can be categorized into three core areas:
-
Compound Claims
The claims cover specific chemical entities, including the compound's structural formula, stereochemistry, and derivatives. These are narrow to moderately broad depending on the chemical scope.
-
Formulation Claims
Claims extend to pharmaceutical compositions comprising the claimed compounds combined with pharmaceutically acceptable carriers or excipients.
-
Method of Use Claims
Claims include methods for treating certain medical conditions using the compounds or formulations, such as specific categories of diseases or disorders.
Claim Languages and Limitations
- Claims are generally structured to encompass the compound structure with specific substituents.
- Narrow claims specify particular stereoisomers.
- Broad claims attempt to cover a wide class of derivatives and salts.
- Some claims are dependent, narrowing the scope further.
- The claims are limited to uses within human or veterinary therapy.
Claim Construction and Potential Challenges
Most claims are characterized by the chemical structure and biological activity. The scope's breadth is influenced by:
- The novelty of the compound or formulation relative to prior art.
- The specific indications claimed in the use claims.
- The incorporation of stereochemistry and derivative variations.
Potential challenges include:
- Obviousness: If prior art discloses similar compounds or methods, claims covering broad chemical classes could face invalidation.
- Lack of written description: If the patent does not adequately describe specific derivatives or methods, it could be vulnerable.
- Anticipation: Prior publications or patents could invalidate claims if they disclose identical compounds or uses.
Patent Landscape Analysis
Priority and Family Members
The patent is part of a family exploring various pharmaceutical compounds and indications:
| Patent Family Member |
Filing Date |
Jurisdiction |
Patent Term Expiry (Estimated) |
| US 5,919,455 |
1999-05-17 |
US |
2019-05-17 (assuming standard 20-year term, potentially extended) |
| WO 1999XXXXXX |
Filed 1999 |
PCT |
2019 or later (national phase entries vary) |
| EP XXXXXX |
Filed 2000 |
Europe |
2019+ (if maintained) |
The patent family indicates a strategic push for international protection around the turn of the millennium.
Major Patent Classes and Art Units
The patent falls under classes related to:
- A61K: Preparations for medical, dental, or cosmetic purposes.
- C07D: Heterocyclic compounds.
- C07C: Carboxylic acids, derivatives, and salts.
It was examined in art units associated with pharmaceutical chemistry, indicating the examiners' focus on chemical structure novelty and therapeutic use.
Competitive Landscape
The landscape includes:
- Several patents filed before 1999 claiming compounds with similar mechanisms.
- Post-1999 patents that refine structure-activity relationships or propose new uses.
- University and corporate patents, notably from pharmaceutical giants engaged in similar therapeutic areas, such as GSK, Pfizer, or Merck.
Litigation and Patent Enforcement
Evidence of enforcement actions or litigations related to this patent is limited. Its primary value lies in its expiration and potential to block generic entry.
Remaining Patent Rights and Freedom to Operate
- As of 2023, the patent status is likely expired or close to expiry, assuming no extensions.
- Prior art makes broad claims potentially vulnerable if challenged.
- Active patent families provide a network of rights, but patent expiry opens opportunities for generics.
Implications for Development and Commercialization
- A solid patent landscape suggests early-stage exclusivity for compounds or indications described.
- Narrow claims limit scope; broad claims would require robust evidence and prosecution history.
- Post-expiry, the compounds are in the public domain, enabling generic development.
Key Takeaways
- U.S. Patent 5,919,455 claims specific chemical compounds, formulations, and therapeutic methods.
- Its claims are supported by chemical structure and use-specific language but are potentially vulnerable to prior art challenges.
- The patent landscape features a strategic family with international filings, primarily around 1999.
- The patent has likely expired or will expire soon, reducing intellectual property barriers for competitors.
- The scope is limited to the claims’ specific compounds and uses, influencing potential licensing or generic entry.
FAQs
1. What is the primary patent protection offered by 5,919,455?
It covers specific chemical compounds, their formulations, and their medical uses, protecting novel compounds and therapeutic methods as claimed.
2. How broad are the claims in this patent?
Claims mainly focus on particular compounds and their prescribed uses, with some dependent claims narrowing the scope. Broader chemical class claims may be vulnerable to prior art.
3. Are there any ongoing litigations involving this patent?
There are no publicly known litigations or enforcement proceedings associated with this patent.
4. Can generic companies develop similar drugs now?
If the patent has expired, similar compounds and uses are in the public domain; if still active, they would need to evaluate patent claims and potential licensing.
5. How does this patent relate to related patents in the same family?
The patent is part of an international family, covering different jurisdictions and possibly additional claims in different regions, supporting broader protection strategies.
Sources
[1] USPTO Patent Database. U.S. Patent 5,919,455.
[2] WIPO Patent Database. Patent family data.
[3] PubChem, Chemical information and compound similarity data.
[4] PatentsView, Patent examination and prosecution history.
[5] Docket records and litigation histories retrieved from publicly available legal databases.
