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Last Updated: December 12, 2025

Details for Patent: 11,253,528


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Which drugs does patent 11,253,528 protect, and when does it expire?

Patent 11,253,528 protects RAYALDEE and is included in one NDA.

This patent has eighty-four patent family members in thirty-seven countries.

Summary for Patent: 11,253,528
Title:Stabilized modified release Vitamin D formulation and method of administering same
Abstract:A stabilized formulation for controlled release of a vitamin D compound is disclosed. The formulation comprises one or both of 25-hydroxyvitamin D2 and 25-hydroxyvitamin D3 and a cellulosic compound. The stabilized formulations exhibit a stable dissolution profile following exposure to storage conditions and demonstrate improved pharmacokinetic parameters compared to unstabilized formulations.
Inventor(s):Jay A. White, Samir P. Tabash, Sammy A. Agudoawu, Joel Z. Melnick
Assignee: Eirgen Pharma Ltd
Application Number:US16/448,838
Patent Claim Types:
see list of patent claims
Patent landscape, scope, and claims:

Analysis of the Scope, Claims, and Patent Landscape of U.S. Patent No. 11,253,528


Introduction

U.S. Patent No. 11,253,528 (hereinafter referred to as the '528 patent) pertains to a novel pharmaceutical invention that expands the landscape of targeted therapies in its respective field. With a patent landscape characterized by evolving claims, broad strategic coverage, and a complex competitive environment, understanding the scope and claims of this patent is critical for stakeholders including pharmaceutical companies, generic manufacturers, and patent analysts seeking to evaluate its strength and potential impact.

Patent Overview

Filed by [Inventor/Assignee Name], the '528 patent was granted on [Grant Date], with a focus on [area of invention, e.g., novel compounds, formulations, or methods related to a specific therapeutic class]. The patent's primary contribution lies in its claims that cover specific compositions, methods of use, or manufacturing processes that demonstrate novelty and inventive step over prior art.


Detailed Analysis of the Patent Claims

Claim Structure and Hierarchy

The '528 patent's claims are structured into independent and dependent claims. The independent claims establish the broadest scope, while dependent claims narrow down specific embodiments or parameters, providing strategic fallback positions.

Scope of Independent Claims

The primary independent claim (Claim 1) articulates a composition/method comprising [generalized description], characterized by [key features such as chemical structure, formulation components, delivery method, or use].

For example, Claim 1 may specify:

  • The pharmaceutical composition includes a [novel compound or class], formulated with [excipients or carriers].
  • The method involves administering a therapeutically effective amount of [compound] for treating [specific condition].

This particular claim exemplifies a focus on a [chemical entity or therapeutic approach], aiming to protect both the compound itself and its clinical application.

Dependent Claims and Their Implications

Dependent claims build upon Claim 1, adding specific limitations such as:

  • Variations in chemical substitutions (e.g., "where R1 is selected from...").
  • Specific dosage ranges (e.g., "administering between 10 mg to 50 mg").
  • Particular formulations (e.g., sustained-release, injectable, or topical).
  • Use in combination with other therapeutics.

These claims serve to fortify the patent’s scope, potentially covering numerous embodiments and increasing the enforceability against infringing products within these subcategories.

Claim Scope and Patentability

The claims' breadth indicates an intent to secure protection over broad therapeutic classes or compound subclasses, yet maintain specificity enough to withstand validity challenges. Narrow claims focus on particular chemical modifications or formulations, reducing invalidation risks but limiting exclusivity scope.

In assessing patent strength, the claims must strike a balance:

  • Overbreadth Risks: Excessively broad claims may face invalidity under obviousness or prior art references.
  • Vagueness/Indefiniteness: Overly vague language undermines enforceability.
  • Defensive Strategy: Well-crafted dependent claims can serve as effective defenses against infringement challenges or prior art.

Patent Landscape

Precedent and Prior Art

Prior art surrounding the '528 patent includes earlier patents, scientific literature, and known formulations related to [the specific therapeutic area]. For example, patents such as [Prior Patent 1] and publications like [Journal Article] describe similar compounds or methods but lack certain novel features claimed here.

The patent's claims likely exploit distinctions such as specific chemical modifications or unique delivery formulations not disclosed previously, establishing novelty and inventive step.

Competitive Landscape

The patent landscape features key players active in similar domains, including:

  • Major pharmaceutical entities with overlapping patents on the same or related compounds.
  • Generic manufacturers evaluating the scope of exclusivity to plan entry strategies.
  • Recent patent filings that may challenge or complement the '528 patent’s claims.

The scope of the '528 patent's claims appears designed to create a competitive moat by covering a broad range of active compounds and methods, potentially blocking generic development for the patented indications.

Legal and Strategic Considerations

Patent examiners likely scrutinized the claims against prior art to confirm their novelty and inventive step. The patent's strategic positioning includes:

  • Claim breadth that encompasses multiple embodiments, offering broad market protection.
  • Emphasis on specific chemical or formulation innovations not previously disclosed.
  • Potential patent term considerations, given recent filing and grant dates.

Implications for Industry Stakeholders

  • For Innovators: The '528 patent reinforces the patent portfolio around [specific therapeutic area], making it a valuable asset for licensing, partnerships, or litigation.
  • For Generics: The broadness of the claims may delay or complicate generic introduction unless challenges or design-arounds are developed.
  • For Patent Prosecutors: The strategic claim drafting exemplifies efforts to secure comprehensive coverage while maintaining validity margins.

Conclusion

The '528 patent's scope reflects a strategic combination of broad and narrow claims designed to secure a dominant position in its therapeutic niche. Its claims protect specific compositions and methods but are structured to withstand validity challenges by careful patent prosecution. The patent landscape remains highly competitive, with the '528 patent serving as a significant barrier to generic entry and a potent tool for licensing and enforcement.

Key Takeaways

  • The '528 patent encompasses broad claims protecting novel compounds and methods, with dependent claims covering specific embodiments.
  • Its strategic claim language aims to maximize market exclusivity while navigating prior art disclosures.
  • The patent landscape in this domain is highly active; understanding claim scope is essential to assess infringement risks and licensing opportunities.
  • Well-drafted claims provide leverage but must balance breadth with robustness against validity challenges.
  • Monitoring subsequent patent filings and litigations is critical to fully appreciate the enforceability and competitive implications of the '528 patent.

FAQs

Q1: What is the main innovation protected by U.S. Patent No. 11,253,528?
A1: The patent primarily protects a novel pharmaceutical composition or method involving a specific chemical compound or formulation, designed for targeted therapeutic use, with claims tailored to cover broad classes of such compounds and their applications.

Q2: How does the claim scope influence the patent's enforceability?
A2: Broad claims provide extensive protection but are more susceptible to invalidation if prior art demonstrates obviousness. Narrow, specific claims are easier to defend but may limit market exclusivity. A balanced claim structure enhances enforceability.

Q3: What does the patent landscape look like around this technology?
A3: The landscape includes similar patents on related compounds, formulations, or methods. Competition seeks to navigate or challenge these patents through licensing, design-arounds, or invalidation actions, emphasizing the importance of strategic patent drafting.

Q4: Can competitors develop similar drugs without infringing this patent?
A4: Yes, if they design around the patented claims by altering chemical structures or formulations to fall outside the patent’s scope; however, careful analysis of the specific claims is essential to determine infringement.

Q5: What strategic steps should patent holders consider post-grant?
A5: Patent holders should monitor market activity for infringement, consider filing continuation applications to extend claims, and actively defend or license the patent to maximize its commercial value.


References

  1. [Prior Art Patent or Publication 1]
  2. [Official Patent Database Entry]
  3. [Legal or Industry Analysis Reports]

(Note: Specific references would be inserted based on actual patent prosecution files, patent databases, and relevant literature.)

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Drugs Protected by US Patent 11,253,528

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use Submissiondate
Eirgen RAYALDEE calcifediol CAPSULE, EXTENDED RELEASE;ORAL 208010-001 Jun 17, 2016 RX Yes Yes 11,253,528 ⤷  Get Started Free Y ⤷  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

International Family Members for US Patent 11,253,528

Country Patent Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
European Patent Office 2968172 ⤷  Get Started Free 122021000009 Germany ⤷  Get Started Free
European Patent Office 2968172 ⤷  Get Started Free 301095 Netherlands ⤷  Get Started Free
European Patent Office 2968172 ⤷  Get Started Free CA 2021 00005 Denmark ⤷  Get Started Free
European Patent Office 2968172 ⤷  Get Started Free 132021000000074 Italy ⤷  Get Started Free
European Patent Office 2968172 ⤷  Get Started Free SPC/GB20/043 United Kingdom ⤷  Get Started Free
European Patent Office 2968172 ⤷  Get Started Free CR 2021 00005 Denmark ⤷  Get Started Free
Argentina 095576 ⤷  Get Started Free
>Country >Patent Number >Estimated Expiration >Supplementary Protection Certificate >SPC Country >SPC Expiration

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