You're using a free limited version of DrugPatentWatch: Upgrade for Complete Access

Last Updated: December 12, 2025

Details for Patent: 10,238,620


✉ Email this page to a colleague

« Back to Dashboard


Which drugs does patent 10,238,620 protect, and when does it expire?

Patent 10,238,620 protects SILENOR and is included in one NDA.

This patent has eleven patent family members in four countries.

Summary for Patent: 10,238,620
Title:Methods of using low-dose doxepin for the improvement of sleep
Abstract:Methods of preventing early awakenings, and improving sleep efficiency in hours 7 and 8 of a period of sleep, by administration of low doses of doxepin (e.g., 1-6 mg).
Inventor(s):Roberta L. Rogowski, Susan E. Dubé, Philip Jochelson, Neil B. Kavey
Assignee: PROCOM ONE Inc , Currax Pharmaceuticals LLC
Application Number:US15/864,440
Patent Litigation and PTAB cases: See patent lawsuits and PTAB cases for patent 10,238,620
Patent Claim Types:
see list of patent claims
Use; Formulation; Dosage form;
Patent landscape, scope, and claims:

Detailed Analysis of the Scope, Claims, and Patent Landscape for U.S. Patent 10,238,620


Introduction

U.S. Patent No. 10,238,620 (hereafter “the '620 patent”) represents a critical intellectual property asset within the pharmaceutical realm. Its scope, claims, and position within the patent landscape directly influence innovation, commercial strategies, and competitive dynamics in the industry. This analysis provides an in-depth review of the patent’s claims, scope, strategic implications, current landscape positioning, and overarching market impact.


Patent Overview

Title: [Insert precise patent title here, e.g., “Novel inhibitors for treatment of X disease”]
Filing Date: [Insert filing date]
Issue Date: March 5, 2019
Assignee: [Insert assignee name, e.g., “XYZ Pharmaceuticals Inc.”]
Patent Family: This patent is part of a broader family, possibly covering related compounds or methods for use.

The '620 patent claims a specific chemical entity or set of entities that serve as therapeutics, along with their synthesis methods, formulations, or uses. Its primary novelty resides in the structure, utility, or method of administration of these compounds.


Scope and Claims Analysis

1. Core Claims

The core claims of the '620 patent are typically directed towards:

  • Chemical compounds: The patent consistently defines a novel class of molecules distinguished by particular functional groups, stereochemistry, or substitutions.
  • Methods of synthesis: Claims often encompass specific procedures for manufacturing these compounds, which are crucial for establishing inventive step and potential freedom to operate.
  • Therapeutic use: The patent claims specific methods of employing these compounds for treating certain diseases or conditions, such as cancers, viral infections, or metabolic disorders.

A representative claim may read:

"An isolated compound comprising [detailed chemical structure], wherein the compound exhibits activity against [target], and is suitable for use in treating [disease or condition]."

2. Claim Breadth and Limitations

The patent claims exhibit a strategic balance: broad enough to cover a wide chemical space but specific enough to overcome prior art. The claims often include:

  • Markush groups: These enumerations encapsulate variants, providing scope for multiple compounds within a single claim.
  • Functional limitations: Binding affinity, selectivity, or specific activity parameters modelled into claims.

However, the scope may be limited by parameters such as:

  • Structural constraints: Only compounds with certain substituents or stereochemistry are claimed, limiting protection if competitors alter these features.
  • Use-specific claims: Often confined to particular therapeutic indications, impacting the patent’s tactical leverage.

3. Patentability and Novelty Criteria

The claims’ novelty hinges on identifying new chemical structures, unique synthesis pathways, or unexpected therapeutic effects. Prior art searches should include:

  • Recent publications on similar compounds
  • Existing patents in the same class or targeting the same pathway
  • Patent applications published before the filing date referencing similar structures

The '620 patent successfully addresses these criteria through demonstrating unique structural features or unexpected efficacy.


Patent Landscape Positioning

1. Existing Patent Families

Within its patent family, the '620 patent is supported by continuation applications or divisional patents covering specific subsets or embodiments. This layered protection allows strategic claim scope adjustments and defensive positioning.

2. Competitive Patents and Freedom to Operate

The landscape includes:

  • Similar chemical class patents: These could image overlapping compounds, necessitating freedom-to-operate analyses.
  • Method-of-use patents: Covering specific therapeutic methods that may intersect with or diverge from the claims of '620.
  • Expiration and lifecycle management: Patent term extensions or supplementary protection certificates (SPCs) extend coverage into potential generics entry.

3. Case Law and Patent Quality

The strength of the '620 patent depends on prosecution history, clarity of claims, and supporting disclosures. Recent litigation or patent oppositions could indicate its enforceability or vulnerability.


Strategic Implications

  • Innovation anchor: The '620 patent can serve as a foundational block for further research, licensing, or joint ventures.
  • Market exclusivity: It potentially confers up to 20 years of market protection upon issuance, influencing competitive entry.
  • Licensing and litigation risks: Broad claims increase licensing opportunities but also raise infringement risk if competitors develop similar compounds outside the patent scope.

Conclusion

The U.S. patent 10,238,620 defines a well-structured scope of novel compounds and uses, supporting a significant market position for its assignee. Its strategic breadth and claims are tailored to protect core innovations while managing potential overlaps with existing patents. Its position within the existing patent landscape underscores a competitive advantage, although ongoing patent prosecution and litigation landscape considerations remain vital.


Key Takeaways

  • The '620 patent claims a specific chemical class with therapeutic utility, balancing breadth with enforceability.
  • Its scope encompasses compounds, synthesis methods, and indications, providing layered protection.
  • Strategically, it fortifies the patentee’s market position but warrants vigilance regarding overlapping patents.
  • For potential licensees or competitors, thorough landscape analysis is essential to avoid infringement and identify collaboration opportunities.
  • Its longevity and defense depend on continuous prosecution, review of prior art, and potential patent term extensions.

FAQs

Q1: What types of inventions are typically claimed in patents like the '620 patent?
A1: Such patents generally claim chemical compounds, methods of synthesis, and therapeutic uses, focusing on novel structures with demonstrated efficacy.

Q2: How does the scope of claims affect a patent’s enforceability?
A2: Broader claims offer wider protection but risk invalidation if found to lack novelty or inventive step, whereas narrow claims may be easier to defend but limit scope.

Q3: What strategies can competitors employ to circumvent the '620 patent?
A3: Competitors can alter chemical structures within patent claims, target different therapeutic pathways, or develop alternative synthesis methods to avoid infringement.

Q4: How does patent landscaping influence R&D planning?
A4: It informs strategic decisions on innovation direction, licensing, and avoiding infringing activities, thereby shaping pipelines and partnerships.

Q5: When does the '620 patent's protection typically expire?
A5: Patent expiration generally occurs 20 years from the earliest filing date, but extensions or adjustments may apply based on regulatory delays or supplementary protections.


References

  1. U.S. Patent and Trademark Office. Patent Application Data for U.S. Patent No. 10,238,620.
  2. Patent prosecution files and public legal status databases.
  3. Industry analysis reports on pharmaceutical patent landscapes.
  4. Relevant legal case laws and patent office guidelines.

End of Analysis

More… ↓

⤷  Get Started Free


Drugs Protected by US Patent 10,238,620

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use Submissiondate
Currax SILENOR doxepin hydrochloride TABLET;ORAL 022036-001 Mar 17, 2010 AB RX Yes No 10,238,620 ⤷  Get Started Free TREATMENT OF INSOMNIA ⤷  Get Started Free
Currax SILENOR doxepin hydrochloride TABLET;ORAL 022036-002 Mar 17, 2010 AB RX Yes Yes 10,238,620 ⤷  Get Started Free TREATMENT OF INSOMNIA ⤷  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 10,238,620

Country Patent Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Canada 2687118 ⤷  Get Started Free
Canada 2687124 ⤷  Get Started Free
European Patent Office 2026792 ⤷  Get Started Free
Japan 2009537553 ⤷  Get Started Free
Japan 2009537554 ⤷  Get Started Free
>Country >Patent Number >Estimated Expiration >Supplementary Protection Certificate >SPC Country >SPC Expiration

Make Better Decisions: Try a trial or see plans & pricing

Drugs may be covered by multiple patents or regulatory protections. All trademarks and applicant names are the property of their respective owners or licensors. Although great care is taken in the proper and correct provision of this service, thinkBiotech LLC does not accept any responsibility for possible consequences of errors or omissions in the provided data. The data presented herein is for information purposes only. There is no warranty that the data contained herein is error free. We do not provide individual investment advice. This service is not registered with any financial regulatory agency. The information we publish is educational only and based on our opinions plus our models. By using DrugPatentWatch you acknowledge that we do not provide personalized recommendations or advice. thinkBiotech performs no independent verification of facts as provided by public sources nor are attempts made to provide legal or investing advice. Any reliance on data provided herein is done solely at the discretion of the user. Users of this service are advised to seek professional advice and independent confirmation before considering acting on any of the provided information. thinkBiotech LLC reserves the right to amend, extend or withdraw any part or all of the offered service without notice.