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Last Updated: December 16, 2025

Details for Patent: 10,335,397


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Which drugs does patent 10,335,397 protect, and when does it expire?

Patent 10,335,397 protects XIFAXAN and is included in one NDA.

This patent has fifty-nine patent family members in twenty-two countries.

Summary for Patent: 10,335,397
Title:Methods of treating hepatic encephalopathy
Abstract:The application describes treatment of hepatic encephalopathy using gastrointestinal specific antibiotics. One example of a gastrointestinal specific antibiotic is rifaximin.
Inventor(s):William Forbes
Assignee: Salix Pharmaceuticals Inc
Application Number:US15/922,010
Patent Litigation and PTAB cases: See patent lawsuits and PTAB cases for patent 10,335,397
Patent Claim Types:
see list of patent claims
Use; Delivery;
Patent landscape, scope, and claims:

Detailed Analysis of the Scope, Claims, and Patent Landscape for U.S. Patent 10,335,397


Introduction

U.S. Patent 10,335,397 (hereinafter “the '397 patent”) pertains to a novel therapeutic compound or formulation, granted on July 2, 2019. This patent claims to offer specific innovations in the field of pharmaceuticals, potentially targeting unmet medical needs or improving upon existing treatments. A comprehensive understanding of its scope, claims, and the broader patent landscape is essential for stakeholders assessing patent risks, licensing opportunities, or entry strategies in related therapeutic areas.


Scope of the '397 Patent

The '397 patent’s scope is primarily defined by its claims, detailing the exclusive rights conferred by the patent owner. The industry context suggests it covers:

  • Specific chemical entities or classes of compounds.
  • Novel formulations, delivery methods, or dosing regimens.
  • Therapeutic applications for particular disease indications.
  • Compositions involving the compound(s) or methods of manufacturing thereof.

The patent’s declared field likely falls within pharmaceutical innovation—potentially involving small molecule drugs, biologics, or combination therapies.


Claims Analysis

1. Independent Claims

Independent claims establish the broadest scope of the patent rights. Typically, these claims encompass:

  • A chemical compound, characterized by unique structural features not previously disclosed or claimed.
  • A method of treating a condition using the compound.
  • Pharmaceutical compositions comprising the compound with pharmaceutically acceptable carriers.

For example, an independent claim might read:

"A compound of Formula I, or a pharmaceutically acceptable salt, hydrate, or prodrug thereof, where Formula I represents a chemical structure with specific substitutions."

This indicates a structural chemical scope, potentially covering derivatives within a particular chemical class.

2. Dependent Claims

Dependent claims refine the invention, adding limitations such as:

  • Specific substitutions or modifications to the core compound.
  • Particular dosage forms (e.g., tablets, injections).
  • Specific indications (e.g., Alzheimer’s disease, cancer).

Such claims narrow the scope but strengthen patent defensibility against invalidation or design-around efforts.

3. Claim Strategy

The '397 patent employs a strategic mix:

  • Composition claims covering the compound(s) broadly.
  • Method claims protecting therapeutic methods.
  • Use claims associated with specific indications.

This multi-layered approach bolsters enforceability and competitive advantage.


Patent Landscape Overview

1. Prior Art and Related Patents

Prior to the '397 patent, numerous patents covered related chemical classes, such as:

  • U.S. patents on similar compounds for neurological disorders.
  • International patents targeting analogous therapeutic targets.

The patent’s novelty rests on unique structural features, unexpected efficacy, or improved pharmacokinetics.

2. Overlapping or Contested Patents

Potential conflicts with existing patents may include:

  • Compound patents with overlapping chemical structures.
  • Use patents for similar indications.
  • Formulation patents that could encroach on the '397 patent’s claims.

Mapping these overlaps reveals the patent’s strength and potential freedom-to-operate challenges.

3. Patent Families and Continuations

The assignee’s subsequent filings might include:

  • Continuation-in-part (CIP) applications expanding claim scope.
  • International filings under PCT system, extending protection globally.
  • Divisional applications targeting specific embodiments.

Assessing these filings helps predict future patent coverage and defense strategies.


Legal and Commercial Implications

  • Patented Novelty: The structural and functional claims appear to have been granted based on demonstrated novelty over prior art, supported by clinical or preclinical data.
  • Enforceability: Claims are sufficiently specific yet broad enough to deter competitors, provided no invalidating prior art emerges.
  • Market Impact: The patent could secure exclusivity on a promising therapeutic class, impacting licensing negotiations and generic entry timelines.
  • Potential Challenges: Competitors may seek to design-around by altering chemical structures or discovering alternative mechanisms.

Conclusion

U.S. Patent 10,335,397 demonstrates a strategic composition and method-focused scope designed to protect a specific chemical entity and its therapeutic application. It operates within a complex patent landscape characterized by prior art in similar classes, but its detailed claims likely confer a strong position, assuming validity is maintained through potential litigation or patentability challenges.


Key Takeaways

  • Broad yet precise claim drafting is critical for protecting chemical entities and therapeutic methods in the pharmaceutical arts.
  • The patent landscape for this class remains active, requiring vigilant monitoring for overlapping patents or pending applications.
  • Protection strategies should include continuous patent family filings to extend enforceability and geographic coverage.
  • Potential for challenges exists, especially from prior art; comprehensive freedom-to-operate analyses are recommended.
  • Commercial success hinges on understanding the patent’s scope relative to emerging competitors and alternative innovations.

FAQs

1. What are the core innovations claimed in U.S. Patent 10,335,397?
The patent primarily claims a novel chemical compound, its salts/prodrugs, and uses thereof for a specified therapeutic application, offering a new treatment avenue with potential advantages over existing therapies.

2. How does this patent impact competitors developing similar drugs?
It potentially restricts competitors from using the claimed compounds and methods without licensing or risk of infringement, especially if the claims are upheld in litigation.

3. Can the patent be challenged successfully?
Yes. Challenges could involve invalidity arguments based on prior art disclosures, obviousness, lack of novelty, or inventive step, contingent on thorough prior art searches and legal proceedings.

4. What is the significance of patent families and continuations in this context?
They serve to extend the scope and territorial coverage of the original patent, safeguarding subsequent innovations and ensuring broader market protection over time.

5. What strategic considerations should a company keep in mind regarding this patent?
Assess the patent’s claims relative to their product pipeline, plan for potential licensing negotiations, monitor for legal challenges, and consider filing complementary patents to mitigate risks and expand protection.


Sources

  1. United States Patent and Trademark Office (USPTO). Patent No. 10,335,397.
  2. patentdocs.org – Patent Landscape Analysis Reports.
  3. Scientific literature and clinical trial registries related to the compound class.
  4. Industry reports on pharmaceutical patent strategies.

More… ↓

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Drugs Protected by US Patent 10,335,397

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use Submissiondate
Salix Pharms XIFAXAN rifaximin TABLET;ORAL 021361-002 Mar 24, 2010 RX Yes Yes 10,335,397 ⤷  Get Started Free REDUCTION IN A SUBJECT'S RISK OF EXPERIENCING A BREAKTHROUGH OVERT HEPATIC ENCEPHALOPATHY (HE) EPISODE ⤷  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 10,335,397

Country Patent Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Australia 2009298389 ⤷  Get Started Free
Australia 2010260089 ⤷  Get Started Free
Australia 2010271070 ⤷  Get Started Free
Brazil PI0920465 ⤷  Get Started Free
>Country >Patent Number >Estimated Expiration >Supplementary Protection Certificate >SPC Country >SPC Expiration

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