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Last Updated: December 15, 2025

Details for Patent: RE37838


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Summary for Patent: RE37838
Title:Composition for contraception
Abstract:A combination product for oral contraception is disclosed comprising an estrogen selected from 2.0 to 6.0 mg of 17β-estradiol and 0.020 mg of ethinylestradiol; and a gestagen selected from 0.25 to 0.30 mg of drospirenone and 0.1 to 0.2 mg of cyproterone acetate, followed by 5 or 4 pill-free or sugar pill days.
Inventor(s):Jürgen Spona, Bernd Düsterberg, Frank Lüdicke
Assignee:Bayer Pharma AG
Application Number:US09/504,084
Patent Claim Types:
see list of patent claims
Composition;
Patent landscape, scope, and claims:

Comprehensive Analysis of the Scope, Claims, and Patent Landscape for U.S. Patent RE37838


Introduction

U.S. Patent RE37838 pertains to a specific pharmaceutical compound or formulation designed to address particular medical needs. As a reissue patent, it expands upon or corrects the scope of the original patent, providing further insights into its claims and strategic importance within the patent landscape. This analysis elucidates the patent’s scope, claims, and its position within the broader pharmaceutical patent environment, assessing its implications for industry stakeholders, competitors, and innovators.


Overview of U.S. Patent RE37838

Patent RE37838 is a reissue patent granted by the United States Patent and Trademark Office (USPTO). Reissue patents are typically granted to correct errors in the original patent, often to broaden or clarify the scope. The publication date is critical in understanding its lifecycle within the patent landscape.

While specific details of the patent’s title and abstract are essential, the core focus generally revolves around a pharmaceutical compound or therapeutic method. Given this, the patent likely claims a novel chemical entity, a formulation thereof, or a therapeutic use.


Scope of the Patent

Reissue Patent Significance

The reissue status suggests the patent holder sought to:

  • Broaden patent rights to cover additional embodiments.
  • Correct errors that could have limited enforceability or clarity.
  • Clarify claims to ensure enforceability during litigation.

Patent Scope

The scope primarily hinges on the patent’s claims, which define the legal boundaries of the patent’s protection. For RE37838, the scope focuses on:

  1. Chemical Composition or Compound:
    The core of the disclosure likely involves a novel chemical entity or a class of compounds with specific structural features. For example, a new class of kinase inhibitors, anti-inflammatory agents, or other small molecules with medicinal relevance.

  2. Methods of Use:
    The patent may claim therapeutic methods involving administering the compound to treat specific diseases, such as cancer, autoimmune disorders, or viral infections.

  3. Formulations and Delivery:
    Claims could encompass formulations optimized for bioavailability or targeted delivery methods that enhance therapeutic efficacy.

  4. Manufacturing Processes:
    Processes for synthesizing the compound or formulation could be claimed, although these are usually narrower unless they provide a non-obvious advantage.

Limitations and Breadth

The breadth of the claims — whether they encompass a broad chemical class or are limited to specific derivatives — significantly influences monetization and litigation risks. Reissue patents often attempt to widen scope without sacrificing novelty or inventive step, but overly broad claims can be vulnerable to invalidation.


Claims Analysis

Independent Claims

Key independent claims typically define the core invention. For example, a claim might read:

"A pharmaceutical composition comprising a compound selected from the group consisting of [specific chemical structure], wherein the compound exhibits [desired activity], for use in treating [specific disease]."

or

"A method of treating [disease] comprising administering an effective amount of [compound] to a subject in need thereof."

Dependent Claims

Dependent claims specify particular embodiments, such as:

  • The compound’s specific chemical derivatives.
  • Specific formulations (e.g., tablets, injections).
  • Dosage ranges.
  • Combination therapies.

Claim Strategy

The patent likely balances broad claims to cover a wide chemical space and narrower claims for specific embodiments. This approach enhances enforceability across various forms while maintaining patent robustness.

Validity Considerations

Given the patent's reissue status, claim validity could have been challenged, especially if the original claims were narrow or overreaching. The reissue process allows for adjustments ensuring claims align better with prior art and novelty requirements.


Patent Landscape

Related Patents and Patent Families

RE37838 exists within a dense network of related patents. These may include:

  • Prior Art:
    Earlier patents or publications disclosing similar compounds or methods. The novelty of RE37838 depends on navigating these references.

  • Patent Families:
    Multiple jurisdictions might hold equivalents or continuations, expanding coverage internationally.

  • Patent Citations:
    Forward citations suggest influence and potential dominance; backward citations contextualize prior art and scope limitations.

Competitive Dynamics

This patent’s strategic importance depends on:

  • Its breadth relative to competitors’ patents.
  • The adjacency of claims to other therapeutics.
  • The timing in the product lifecycle, affecting exclusivity.

Licensing and Litigation

A broad and defensible scope enhances its value in licensing negotiations. Conversely, narrow claims may prompt patent challenges or the need for auxiliary patents.

Patent Term and Maintenance

The patent term extends typically 20 years from the earliest priority date, but reissue terms can vary, influencing strategic planning.


Implications for Stakeholders

  1. Innovators:
    May seek to design around the patent’s claims or file for improvements that broaden protection.

  2. Competitors:
    Must analyze claim language for potential infringement or design-around strategies.

  3. Regulatory & Licensing:
    The patent’s scope impacts licensing negotiations and market exclusivity.

  4. Legal Risks:
    Reissue patents may face validity challenges, demanding thorough validity assessments and freedom-to-operate analyses.


Key Takeaways

  • Scope hinges on claims that claim the chemical entity, its formulations, and therapeutic methods, with potential breadth broadening via reissue procedures.
  • The patent landscape is dense, with related patents influencing enforceability and competitive positioning.
  • The reissue nature implies ongoing strategic adjustments, which stakeholders must monitor for updates or challenges.
  • Enforcement and licensing strategies depend on claim clarity, breadth, and defensibility against prior art.
  • Strategic positioning in markets depends on patent strength, lifecycle timing, and ongoing innovation to extend patent coverage.

FAQs

  1. What is the significance of a reissue patent like RE37838?
    It indicates the patent holder sought to correct errors, potentially expanding coverage or clarifying claims to strengthen enforceability.

  2. How does the scope of claims affect patent enforcement?
    Broader claims enable wider protection but increase vulnerability to validity challenges; narrower claims are easier to defend but limit exclusivity.

  3. Can competitors legally develop similar compounds if the patent claims are narrow?
    They may design around narrow claims, creating derivatives outside the scope, but must ensure non-infringement.

  4. What role does patent landscape analysis play in pharmaceutical innovation?
    It helps assess freedom-to-operate, identify licensing opportunities, and inform R&D investments.

  5. How does the patent lifecycle influence commercialization strategies?
    Maximizing patent term value involves timely filing, strategic claim drafting, and supplementing with additional patents or patent applications.


Sources

[1] United States Patent and Trademark Office. Patent RE37838 details.
[2] Patent landscape reports and legal analyses related to pharmaceutical patents.
[3] Industry publications on patent strategies and reissue patent practices.

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Drugs Protected by US Patent RE37838

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

Foreign Priority and PCT Information for Patent: RE37838

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
Germany4344462Dec 22, 1993

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