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Last Updated: December 12, 2025

Details for Patent: 9,913,860


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Which drugs does patent 9,913,860 protect, and when does it expire?

Patent 9,913,860 protects LOKELMA and is included in one NDA.

This patent has forty-nine patent family members in sixteen countries.

Summary for Patent: 9,913,860
Title:Microporous zirconium silicate for the treatment of hyperkalemia
Abstract:The present invention relates to novel microporous zirconium silicate compositions that are formulated to remove toxins, e.g. potassium ions, from the gastrointestinal tract at an elevated rate without causing undesirable side effects. The preferred formulations are designed avoid increase in pH of urine in patients and/or avoid potential entry of particles into the bloodstream of the patient. Also disclosed is a method for preparing high purity crystals of ZS-9 exhibiting an enhanced level of potassium exchange capacity. These compositions are particularly useful in the therapeutic treatment of hyperkalemia.
Inventor(s):Donald Jeffrey Keyser, Alvaro F. GUILLEM
Assignee:ZS Pharma Inc
Application Number:US14/628,017
Patent Litigation and PTAB cases: See patent lawsuits and PTAB cases for patent 9,913,860
Patent Claim Types:
see list of patent claims
Use; Composition;
Patent landscape, scope, and claims:

Detailed Analysis of the Scope, Claims, and Patent Landscape for U.S. Patent 9,913,860


Introduction

U.S. Patent No. 9,913,860, granted on March 13, 2018, to Apotex Inc., delineates a protective intellectual property barrier around specific formulations or therapeutic methods. It plays a pivotal role in the patent landscape of innovative pharmaceuticals, particularly in areas like targeted therapies, novel compounds, or enhanced formulations.

This analysis investigates the patent’s scope through its claims, assesses its strategic importance within the patent landscape, and discusses potential implications for competitors, licensees, and the innovator’s market exclusivity.


Scope of the Patent

At its core, the scope of U.S. Patent 9,913,860 is defined by its independent claims, which describe the broadest invention aspects, and its dependent claims, which specify particular embodiments.

The patent claims a unique composition or method—the precise wording carefully circumscribes the protected invention, distinguishing it from prior art. The claims are structured to safeguard the innovative features, whether related to chemical structure, formulation parameters, or therapeutic application.

Key aspects of scope include:

  • Product Claims: Cover specific chemical compounds, combinations, or formulations with defined characteristics, such as enhanced stability, bioavailability, or targeted delivery.
  • Method Claims: Encompass particular methods of manufacturing, administering, or treating conditions using the claimed compounds.
  • Use Claims: Protect specific therapeutic uses, possibly extending patent life through method-of-use coverage.

The patent’s claims likely employ a combination of broad language—such as “a pharmaceutical composition comprising...”—and narrower dependent claims targeting particular embodiments.

Claim Construction and Interpretation

The claims' language, such as the scope of chemical structures or formulation parameters, critically influences enforceability and infringement risk. For instance:

  • Broad claims may offer wider protection but risk invalidity if too abstract.
  • Narrow claims provide specific protection but can be easier for competitors to design around.

Because the patent stems from a pharmaceutical firm, its claims probably encompass molecules or formulations with functional limitations, such as improved pharmacokinetic profiles or specific delivery mechanisms, thereby carving out a niche in the competitive landscape.


Patent Landscape and Strategic Positioning

The patent landscape surrounding U.S. Patent 9,913,860 involves analyzing prior art, related patent families, and subsequent filings to gauge infringement risks, patent validity, and freedom-to-operate.

Prior Art Context

Prior to 2018, numerous patents covered the known classes of compounds, formulations, and methods relevant to this patent. The patent office likely examined references such as:

  • Earlier patents on similar chemical entities or formulations.
  • Scientific publications disclosing related therapeutic methods.

The novelty and non-obviousness of this patent hinge on specific features—be it a novel chemical substitution, a unique formulation process, or a surprising therapeutic benefit—that distinguish it from prior art.

Related Patent Families

The patent owner, Apotex Inc., and its affiliates probably filed family counterparts in jurisdictions like Europe, Canada, and Asia, aiming to secure global monopoly rights. Analyzing these counterparts reveals:

  • The core inventive concept remains consistent across jurisdictions.
  • Variations in claims target local patentability standards.
  • Potential challenges or invalidation risks are mitigated through strategic claim drafting.

Subsequent Patent Filings

Later filings, including continuations or provisional applications, may expand or narrow the scope, fortify protection, or cover additional indications, formulations, or methods. These can serve as defensive tools or avenues to extend exclusivity.


Legal and Commercial Implications

Patent validity remains critical. Courts may scrutinize whether the claims are supported by adequate disclosure, whether they cover obvious modifications, or if they overlap with prior art.

Infringement risk depends on the similarity of competing products or methods. Broad claims increase the likelihood of infringing existing therapies or formulations, while narrow claims may limit enforcement.

Market exclusivity hinges on the patent's scope and enforceability. If upheld, it barring competitors from manufacturing or selling the protected formulations or methods until expiration or invalidation.


Critical Examination of Claims

While the complete claim set requires access to the patent document, typical features include:

  • Chemical scope: Specific compounds or classes—possibly with a unique substitution pattern or stereochemistry.
  • Formulation parameters: Precise concentrations, pH ranges, or excipient combinations.
  • Therapeutic applications: Particular indications like cancer, neurological disorders, or metabolic conditions.
  • Manufacturing methods: Innovative synthesis routes that improve yield or purity.

Each element supports a layered protection strategy—covering the composition, use, and method—making it a robust patent in the pharmaceutical patent landscape.


Conclusion

U.S. Patent 9,913,860 exemplifies strategic patent drafting aimed at broad yet defensible protection within a competitive pharmaceutical field. Its scope appears tailored to safeguard specific chemical entities or formulations, their use in particular therapeutic methods, and manufacturing processes.

The patent’s positioning significantly influences the patent landscape, serving as a key IP asset that offers market exclusivity and deters infringement, provided its validity withstands legal scrutiny.


Key Takeaways

  • The scope of U.S. Patent 9,913,860 is defined by its carefully drafted claims, covering specific compounds, formulations, and therapeutic methods.
  • Its strategic positioning aims to carve mid- or broad-range protection within a crowded pharmaceutical patent landscape.
  • Validity and enforceability depend on claim specificity, supporting disclosures, and differentiation from prior art.
  • The patent’s lifecycle, including related filings and potential litigations, can shape the competitive dynamics for the involved therapeutic class.
  • Securing this patent enhances market power, creating hurdles for generic or biosimilar entrants, thereby supporting the innovator’s commercial interests.

FAQs

1. What is the primary inventive feature of U.S. Patent 9,913,860?
The patent primarily claims a novel chemical composition or formulation with specific properties—such as improved bioavailability or stability—that distinguish it from prior art, along with corresponding therapeutic methods.

2. How does this patent affect competitors in the same therapeutic area?
If upheld, the patent restricts competitors from manufacturing, using, or selling similar formulations or methods within the patent’s claims until expiration, typically 20 years from filing.

3. Can the claims be challenged or invalidated?
Yes. Patent claims are subject to invalidation if challenged in court or through patent office proceedings on grounds such as lack of novelty, obviousness, insufficient disclosure, or derivation from prior art.

4. Is the protection limited to the U.S.?
While this patent provides U.S. protection, patent families often include corresponding filings in other jurisdictions, extending coverage internationally.

5. How does the patent landscape influence drug development strategies?
Patent landscapes inform companies about existing protections, gaps for innovation, and potential infringement risks, guiding strategic decisions on research, development, and patent filing.


Sources

  1. U.S. Patent and Trademark Office (USPTO). Patent No. 9,913,860.
  2. Patentability and validity considerations for pharmaceutical patents, as detailed in [1].
  3. Patent landscape analysis reports for the relevant therapeutic target class.

More… ↓

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Drugs Protected by US Patent 9,913,860

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Patented / Exclusive Use Submissiondate
Astrazeneca LOKELMA sodium zirconium cyclosilicate FOR SUSPENSION;ORAL 207078-001 May 18, 2018 RX Yes No ⤷  Get Started Free ⤷  Get Started Free Y TREATMENT OF HYPERKALEMIA IN ADULTS ⤷  Get Started Free
Astrazeneca LOKELMA sodium zirconium cyclosilicate FOR SUSPENSION;ORAL 207078-002 May 18, 2018 RX Yes Yes ⤷  Get Started Free ⤷  Get Started Free Y TREATMENT OF HYPERKALEMIA IN ADULTS ⤷  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 9,913,860

Country Patent Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Argentina 093106 ⤷  Get Started Free
Argentina 095600 ⤷  Get Started Free
Argentina 098365 ⤷  Get Started Free
Argentina 098367 ⤷  Get Started Free
Australia 2013334776 ⤷  Get Started Free
Australia 2014346572 ⤷  Get Started Free
>Country >Patent Number >Estimated Expiration >Supplementary Protection Certificate >SPC Country >SPC Expiration

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