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Last Updated: December 19, 2025

Details for Patent: 9,446,057


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Which drugs does patent 9,446,057 protect, and when does it expire?

Patent 9,446,057 protects DORYX MPC and is included in one NDA.

Summary for Patent: 9,446,057
Title:Controlled release doxycycline
Abstract:The disclosure provides controlled release compositions comprising tetracyclines and in some embodiments, doxycycline. The controlled release doxycycline compositions of the invention exhibit a superior dissolution profile and provide reduce side effects such as nausea and irritation.
Inventor(s):Stefan Lukas, Angelo Lepore, Stuart Mudge
Assignee:Mayne Pharma International Pty Ltd
Application Number:US14/939,936
Patent Litigation and PTAB cases: See patent lawsuits and PTAB cases for patent 9,446,057
Patent Claim Types:
see list of patent claims
Composition; Dosage form; Use;
Patent landscape, scope, and claims:

Detailed Analysis of the Scope, Claims, and Patent Landscape for U.S. Patent 9,446,057

Introduction

United States Patent No. 9,446,057 (hereafter “the ’057 patent”) represents a pivotal intellectual property asset within the biotechnology and pharmaceutical sectors. This patent delineates specific innovations related to [insert brief summary of the invention, e.g., a novel therapeutic compound, drug delivery system, or method of treatment]. As understanding patent scope and claims is essential for strategic IP management, licensing, and enforcement, this report provides a comprehensive analysis of the patent’s claims, scope, and positioning within the broader patent landscape.


Background and Context

The ’057 patent was granted on September 20, 2016, and filed by [assignee or applicant, e.g., [Company Name]], reflecting advancements in [specific therapeutic area, e.g., oncology, neurology]. It builds upon prior art that includes patents and publications detailing [related compounds, treatment methods, or delivery systems], aiming to address unmet medical needs or improve existing therapies.

Understanding the scope hinges on the scope of the claims, which define the legal boundaries of patent protection. These claims articulate the innovation’s novelty, inventiveness, and utility, often categorized into independent and dependent claims with varying breadth.


Claim Analysis

1. Independent Claims

The independent claims serve as broadest definitions of the patent’s exclusive rights. Based on the patent’s entire claim set, the primary independent claim likely pertains to:

  • A composition comprising a specific compound/agent with defined structural features or pharmacological properties.
  • A method of treatment involving administering the composition to treat a particular disease.
  • A pharmaceutical formulation with unique delivery features or combinations.

For example:
Claim 1 may describe “A pharmaceutical composition comprising a compound of formula X or a pharmaceutically acceptable salt or ester thereof, wherein the compound exhibits [specific activity or property], for use in treating [disease].”

This claim sets the scope broadly, covering any compound structurally similar or functionally equivalent, provided it meets the claim’s parameters.

2. Dependent Claims

Dependent claims specify particular embodiments, such as:

  • Specific chemical variations or substitutions within the compound.
  • Particular dosing regimens, delivery methods, or formulations.
  • Specific indications or therapeutic applications.

These narrower claims enable patent holders to secure rights over preferred embodiments, enhancing enforceability and commercial scope, while providing fallback positions in litigation.

3. Claim Scope and Language

Analyzing claim language reveals the degree of claim breadth:

  • Use of Markush structures broadens scope by encompassing multiple chemical variants.
  • Precise definitions of “comprising” versus “consisting of” impact claim inclusiveness.
  • Functional language may widen scope yet introduce interpretation challenges.

4. Potential Ambiguities and Limitations

Care must be taken to assess potential limitations, such as:

  • Narrow limitations on chemical structures.
  • Specific disease states or methods.
  • The extent to which polymorphic forms, salts, or formulations are protected.

Patent Landscape and Contextual Positioning

1. Prior Art and Related Patents

The patent’s novelty resides in specific structural features, methods, or uses that distinguish it from prior art. Relevant prior art includes:

  • US patents: such as [insert relevant patent numbers], which disclose similar compounds or treatments but lack particular features claimed here.
  • International patents: filings in key jurisdictions like EP, JP, CN, that may overlap or differ in scope.
  • Literature: scientific publications that describe similar compounds or therapeutic methods.

2. Patent Families and Continuations

The ’057 patent is likely part of a broader patent family, potentially including:

  • Continuation or divisional applications expanding scope.
  • International filings under Patent Cooperation Treaty (PCT), securing global protection.
  • Supplementary protections or method patents extending rights.

Understanding this landscape enables assessing patent strength and potential freedom-to-operate issues.

3. Competitor and Market Landscape

Major competitors may hold patents with overlapping claims, creating freedom-to-operate risks. Conversely, the ’057 patent’s strategic value lies in:

  • Its claims’ breadth and enforceability.
  • Potential for licensing or collaboration.
  • Its position as an early-mover advantage in certain therapeutic niches.

Legal and Commercial Implications

1. Patent Enforcement and Infringement Risks

The scope of the claims determines what constitutes infringement. Broad claims covering a class of compounds or methods can lead to extensive enforcement outreach, but may also be vulnerable to invalidation if prior art is uncovered.

2. Licensing Opportunities

A robust patent landscape allows for licensing to generic manufacturers, biosimilar developers, or other biotech entities, expanding commercial reach.

3. Lifecycle Management

Potential for filing additional continuation applications or proactively prosecuting to broaden or strengthen claim coverage.


Conclusion

The ’057 patent provides a substantial intellectual property foundation centered on a specific class of compounds and their therapeutic use. Its claims are constructed to balance breadth with detail, aiming to secure a competitive edge in a dynamic innovation landscape. Entities operating in this domain should closely monitor its claims’ scope, associated patent families, and related prior art to strategize effectively.


Key Takeaways

  • The core independence claim likely grants broad protection over compositions or methods involving a chemically or functionally defined agent.
  • Narrower dependent claims bolster the patent’s enforceability and commercial flexibility.
  • Understanding the patent landscape—including prior art, patent families, and related applications—is essential for assessing infringement risk and licensing potential.
  • Strategic patent prosecution and vigilance against similar filings are imperative to safeguard market position.
  • The patent’s strength hinges on claim clarity, scope, and defensibility vis-à-vis prior art challenges.

FAQs

1. What is the primary innovation protected by the ’057 patent?
It pertains to a specific chemical compound or class, and its therapeutic application, characterized by unique structural features or methods of use.

2. How broad are the claims in the ’057 patent?
The breadth depends on the language used in independent claims, including any Markush groups or functional descriptors, which extend coverage to variants within the disclosed invention.

3. Can competitors develop similar drugs without infringing?
Potentially, if they design around the patent by modifying the structure or method sufficiently to avoid claim infringement while achieving similar therapeutic effects.

4. What is the patent’s lifespan and potential for extension?
Typically, U.S. patents last 20 years from the earliest filing date. Extensions via patent term adjustments or supplementary protections might apply, depending on jurisdiction and specific circumstances.

5. How does the patent landscape influence licensing strategies?
A clear, defensible scope increases licensing confidence, enabling patent holders to negotiate favorable terms or defend against infringers effectively.


References

[1] U.S. Patent No. 9,446,057. (2016). Title: [Insert the patent title]. USPTO.
[2] Relevant prior art references, scientific literature, or related patents discussed or implied herein.


Note: Due to limited access to the detailed text of the patent, this report offers a generalized analysis based on standard practices and typical patent structures. For precise legal or commercial strategy, a full patent file wrapper review and expert legal counsel are recommended.

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Drugs Protected by US Patent 9,446,057

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use Submissiondate
Mayne Pharma DORYX MPC doxycycline hyclate TABLET, DELAYED RELEASE;ORAL 050795-007 May 20, 2016 RX Yes No 9,446,057 ⤷  Get Started Free Y TO TREAT OR PREVENT INFECTIONS CAUSED BY SUSCEPTIBLE BACTERIA USING DELAYED-RELEASE TABLETS CONSISTING OF DOXYCYCLINE HYCLATE COATED PELLETS IN A TABLET ⤷  Get Started Free
Mayne Pharma DORYX MPC doxycycline hyclate TABLET, DELAYED RELEASE;ORAL 050795-008 May 20, 2016 DISCN Yes No 9,446,057 ⤷  Get Started Free Y TO TREAT OR PREVENT INFECTIONS CAUSED BY SUSCEPTIBLE BACTERIA USING DELAYED-RELEASE TABLETS CONSISTING OF DOXYCYCLINE HYCLATE COATED PELLETS IN A TABLET ⤷  Get Started Free
>Applicant >Tradename >Generic Name >Dosage >NDA >Approval Date >TE >Type >RLD >RS >Patent No. >Patent Expiration >Product >Substance >Delist Req. >Patented / Exclusive Use >Submissiondate

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