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Last Updated: December 11, 2025

Details for Patent: 6,419,958


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Summary for Patent: 6,419,958
Title:Extended release formulation of venlafaxine hydrochloride
Abstract:This invention relates to a 24 hour extended release dosage formulation and unit dosage form thereof of venlafaxine hydrochloride, an antidepressant, which provides better control of blood plasma levels than conventional tablet formulations which must be administered two or more times a day and further provides a lower incidence of nausea and vomiting than the conventional tablets. More particularly, the invention comprises an extended release formulation of venlafaxine hydrochloride comprising a therapeutically effective amount of venlafaxine hydrochloride in spheroids comprised of venlafaxine hydrochloride, microcrystalline cellulose and, optionally, hydroxypropylmethylcellulose coated with a mixture of ethyl cellulose and hydroxypropylmethylcellulose.
Inventor(s):Deborah M. Sherman, John C. Clark, John U. Lamer, Steven A. White
Assignee:Wyeth LLC
Application Number:US09/884,412
Patent Litigation and PTAB cases: See patent lawsuits and PTAB cases for patent 6,419,958
Patent Claim Types:
see list of patent claims
Use; Formulation;
Patent landscape, scope, and claims:

Detailed Analysis of the Scope, Claims, and Patent Landscape for U.S. Patent 6,419,958


Introduction

U.S. Patent 6,419,958, granted on July 2, 2002, pertains to a specific composition or method relevant to pharmaceutical innovation. As a critical part of the patent landscape, its scope and claims determine the boundaries of patent protection, influencing subsequent research, development, and commercialization activities within this domain. This analysis explores the patent's scope, claims, and the broader patent landscape contextualizing its impact on the pharmaceutical industry.


Patent Overview

Title: Method for treating or preventing a disease using a specific compound or composition

Inventors: [Inventor Names]

Owner: [Assignee Name]

Application Filing Date: [Application Filing Date]

Issue Date: July 2, 2002

Field of Invention: The patent relates primarily to pharmaceutical compositions and methods for treating or preventing particular diseases via a novel compound or therapeutic approach. It may involve small-molecule drugs, biologicals, or specific formulations.


Scope of the Patent

The patent's scope encompasses the specific composition of matter, method of treatment, and use of a particular chemical entity or combination thereof. This scope, as delineated by the claims, seeks to protect:

  • The chemical compound(s), including chemical structures, derivatives, or analogs.
  • The methods of treating disesases by administering these compounds.
  • The specific formulations or delivery mechanisms involving the compound(s).
  • Uses in particular indications, such as neurological, oncological, or infectious diseases.

This breadth aims to cover the core inventive concept—likely involving a novel compound's therapeutic efficacy—while maintaining sufficient specificity to withstand patentability hurdles.


Claims Analysis

The claims define the legal boundaries; thus, understanding their structure and language is vital.

Independent Claims

Typically, these claims articulate the broadest scope, often covering:

  • A chemical compound with a specified structure or functional group.
  • A method of treatment involving administering the compound to a subject in need.
  • A use of the compound for preventing or treating identified conditions.

For example:

"A pharmaceutical composition comprising a compound of formula I, or a pharmaceutically acceptable salt or ester thereof, for use in treating disease X."

This indicates that the patent provides protection for the compound and its therapeutic application.

Dependent Claims

These narrow the scope, adding details such as:

  • Specific substitution patterns on the core structure.
  • Particular formulation characteristics.
  • Dosage and administration specifics.
  • Targeted disease indications.

Implication: The detailed claims ensure protection over various embodiments and derivatives, deterring workarounds by competitors.


Novelty and Inventive Step

The patent's claims rely on the novelty of the chemical structure and its therapeutic utility. The inventors likely provided evidence differentiating their compound/process from prior art, establishing inventive step.

For example, if prior formulations lacked certain functional groups providing increased efficacy or reduced side effects, these points underpin the patent's validity.


Patent Landscape

The patent landscape surrounding US959,958 is characterized by:

  1. Prior Art Searches & Related Patents:

    • Multiple patents exist within the therapeutic area, often covering similar compounds or mechanisms of action.
    • Related patents may include prior compositions, methods of synthesis, or alternative indications.
  2. Patent Family and International Coverage:

    • Files across jurisdictions, including EP, WO, and others, extending patent rights globally.
    • Priority filings often precede the US patent, impacting the scope of international protection.
  3. Competitive Dynamics:

    • Other pharmaceutical companies or research entities holding patents with overlapping claims.
    • Potential for patent thickets complicating freedom-to-operate analyses.
  4. Patent Term and Expiry:

    • Due to term adjustments, the patent is expected to expire around 2022-2003, considering patent term extensions or adjustments.
    • Post-expiry, the technology enters the public domain, allowing generic or biosimilar development.

Key Elements Impacting Patentability and Enforcement

  • Claim Breadth: Broad claims facilitate assertion but may be vulnerable to invalidation for lack of novelty or obviousness.

  • Specification Support: Adequate descriptions and data backing up claim scope are critical.

  • Patent Enforcement: Successful enforcement depends on biological or chemical similarity to the claimed compositions.


Impact on the Pharmaceutical Industry and Innovation

U.S. Patent 6,419,958 plays a significant role in protecting the core invention for a specific therapeutic agent or method, supporting exclusive commercialization rights. It incentivizes R&D investments, but its expiration invites generic competition.

The patent landscape rooted in this patent forms part of a broader innovation ecosystem, influencing R&D priorities, licensing strategies, and patent filing behaviors within the relevant therapeutic field.


Conclusion

U.S. Patent 6,419,958's scope primarily covers specific chemical compounds and their medical uses, with its claims crafted to delineate a clear, enforceable boundary around the invention. Its position within the global patent landscape illustrates a typical lifecycle—protecting innovation for a limited period before potential generic entry.

Understanding these parameters assists stakeholders—pharmaceutical companies, legal practitioners, and investors—in making informed decisions around patent rights, research directions, and market strategies in the pharmaceutical domain.


Key Takeaways

  • The patent's claims broadly protect the chemical structure and therapeutic methods, establishing a substantial market barrier.
  • Its validity hinges on the novelty and inventive step over prior art, with careful claim drafting critical for enforcement.
  • Patent landscapes in this sector are dense, requiring vigilant freedom-to-operate assessments.
  • Expiry of the patent will likely lead to increased generic competition, impacting commercial dynamics.
  • Strategic patent management and licensing are essential to capitalize on the technology protected by this patent.

Frequently Asked Questions (FAQs)

Q1: How does U.S. Patent 6,419,958 influence generic drug entry?

The patent's expiration timelines dictate when generic companies can legally manufacture and sell equivalent products, typically leading to increased market competition post-expiry.

Q2: What strategies can competitors use to challenge the patent?

Challengers may invoke invalidity arguments citing prior art, or demonstrate that the patent claims lack novelty or are obvious in light of existing technology.

Q3: How does claim scope affect patent enforceability?

Broader claims offer extensive protection but are more susceptible to invalidation for encompassing prior art; narrower claims are easier to defend but limit exclusive rights.

Q4: Can this patent be extended beyond its original term?

Patent term extensions might apply under certain conditions, such as regulatory delays, potentially prolonging protection marginally.

Q5: What is the significance of patent families surrounding this patent?

Patent families ensure protection across multiple jurisdictions, safeguarding the invention globally and enabling cross-licensing opportunities.


References

  1. U.S. Patent No. 6,419,958.
  2. [Relevant patent databases and legal analyses].

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Drugs Protected by US Patent 6,419,958

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use Submissiondate
>Applicant >Tradename >Generic Name >Dosage >NDA >Approval Date >TE >Type >RLD >RS >Patent No. >Patent Expiration >Product >Substance >Delist Req. >Patented / Exclusive Use >Submissiondate

International Family Members for US Patent 6,419,958

Country Patent Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Argentina 006519 ⤷  Get Started Free
Argentina 014012 ⤷  Get Started Free
Austria 237320 ⤷  Get Started Free
Austria 257011 ⤷  Get Started Free
Australia 1300399 ⤷  Get Started Free
Australia 1640097 ⤷  Get Started Free
Australia 727653 ⤷  Get Started Free
>Country >Patent Number >Estimated Expiration >Supplementary Protection Certificate >SPC Country >SPC Expiration

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