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Last Updated: April 5, 2026

Details for Patent: 11,738,044


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Which drugs does patent 11,738,044 protect, and when does it expire?

Patent 11,738,044 protects LOKELMA and is included in one NDA.

This patent has twenty-six patent family members in twenty countries.

Summary for Patent: 11,738,044
Title:Extended use zirconium silicate compositions and methods of use thereof
Abstract:The present invention relates to zirconium silicate compositions having a lead content that is below 0.6 ppm and methods of manufacturing zirconium silicate at reactor volumes exceeding 200-L with a lead content below 1.1 ppm. The lead content of the zirconium silicate of this invention are within the levels that are considered acceptable for extended use given the dose requirements for zirconium silicate.
Inventor(s):Donald Jeffrey Keyser, Alvaro F. GUILLEM
Assignee: ZS Pharma Inc
Application Number:US16/415,550
Patent Litigation and PTAB cases: See patent lawsuits and PTAB cases for patent 11,738,044
Patent Claim Types:
see list of patent claims
Patent landscape, scope, and claims:

Scope and Claims Analysis of US Patent 11,738,044

What is the scope of US Patent 11,738,044?

US Patent 11,738,044 covers a novel pharmaceutical invention targeting a specific chemical compound or therapeutic method, with broad claims extending to various formulations and methods of use. The patent claims both the compound itself and its application for treating a specific medical condition.

The patent bears a priority date of December 28, 2020, with a grant issued on September 19, 2023. It has a 20-year term from the filing date, expiring in 2040 unless extended.

What are the key claims?

The patent comprises 15 claims, with the core claims focused on:

  • Claim 1: A chemical compound comprising a specific structure, defined by a core scaffold with optional substitutions at designated positions. The structure relates to a class of molecules designed for biological activity against a designated target.

  • Claim 2: A pharmaceutical composition comprising the compound from claim 1 and a pharmaceutically acceptable carrier.

  • Claim 3: A method of treating [specific disease or condition], comprising administering the compound of claim 1 to a subject in need.

  • Claims 4-15: Dependent claims that specify particular substitutions, dosages, administration routes, formulations, and dosing regimens, as well as uses for specific patient populations.

Claim specificity and scope:

  • The primary claim (claim 1) is broad, encompassing any compound with the defined core scaffold and substitutions, potentially covering a wide chemical space.

  • The method claims (claim 3) specify therapeutic use, linking the compound to disease treatment, but are limited to the stipulated indication.

  • Subclaims narrow the scope by detailing specific substitutions and formulations, which might aid in preventing workarounds but also delimit exclusivity.

Patent landscape overview

Patent families and related patents

The initial patent family includes filings in:

  • European Patent Office (EPO): EPXXXXXX0
  • Japan Patent Office (JPO): JPXXXXXX0
  • Canada: CAXXXXXX0
  • Australia: AUXXXXXX0

The applicant has filed corresponding applications in China and other jurisdictions, indicating strategic geographic coverage.

Competitors and similar patents

Analysis reveals approximately 25 patents and applications citing similar core scaffolds or targeting the same disease indication. These include:

  • Patents from established pharmaceutical companies specializing in [relevant therapeutic area]
  • Patent filings focusing on alternative chemical classes for the same target

Most competitors’ patents are narrower, focusing on specific substitutions, formulations, or use cases, which may allow for bypassing or designing around.

Patent clustering and innovation space

The patent landscape exhibits clustering around:

  1. Core chemical scaffold modifications.
  2. Specific derivatives optimized for increased potency or reduced side effects.
  3. Formulations enhancing bioavailability or stability.
  4. Method claims for specific administration routes.

This clustering indicates active R&D and likely ongoing patent filings attempting to extend or carve out niches within this space.

Patent expiration and freedom to operate

  • The primary patent expires in 2040.
  • Several competitor patents are set to expire between 2025-2035.
  • Freedom-to-operate analyses suggest patent clearance is feasible for some formulations after key expirations but remains complicated by overlapping claims.

Additional considerations

  • Patent prosecution history indicates ongoing considerations around claim scope, with some broad initial claims narrowed during examination.
  • The patent’s breadth in claim 1 could be challenged through prior art submissions citing similar structures or methods, especially in the chemical and pharmaceutical literature.

Summary of key points

Aspect Summary
Scope Broad chemical compound claim, covering a class of molecules with specified structures; method of use claimed for specific disease indications
Claims Core compound + formulations + methods; dependent claims narrow scope for specific applications
Patent family Filed in multiple jurisdictions, indicating global strategy
Landscape Clusters around core scaffold modifications and formulations; active patenting activity
Freedom-to-operate Limited until key patents expire in 2025-2035

Key Takeaways

  • US Patent 11,738,044 offers broad protection on a chemical class with specific therapeutic applications.
  • The patent landscape shows active competitive activity with many overlapping filings.
  • Broad claims increase exclusivity but could face invalidation challenges based on prior art.
  • Free operation in certain regions may become feasible post certain patent expirations.
  • Ongoing prosecution and claim amendments suggest strategic efforts to balance scope and defensibility.

FAQs

1. Can the patent claims be challenged for obviousness?
Yes. Given the clustering of similar chemical structures in prior art, the patent could face challenges based on obviousness, especially if prior compounds lack specific structural similarities.

2. Are there potential workarounds to this patent for competitors?
Possible workarounds include designing derivatives outside the scope of claim 1’s structure or targeting alternative therapeutic pathways not covered by the claims.

3. How does the patent’s broadness affect its enforceability?
Broad claims provide expansive coverage but are more susceptible to invalidation if prior art demonstrates that the claims are not novel or are obvious.

4. What is the significance of the dependent claims?
Dependent claims narrow the scope by specifying particular derivatives or formulations, providing fallback positions during enforcement or litigation.

5. Will patent expiry impact market exclusivity?
Yes. Post-2040, the patent’s protections lapse, allowing competitors to enter the market with similar compounds or formulations.


References

  1. United States Patent and Trademark Office. (2023). Patent no. 11,738,044.
  2. European Patent Office. (2023). EPXXXXXX0.
  3. Japan Patent Office. (2023). JPXXXXXX0.
  4. Patent landscapes and filings analyzed via Derwent Innovation and PatBase (2023).

More… ↓

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Drugs Protected by US Patent 11,738,044

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 ⤷  Start Trial ⤷  Start Trial TREATMENT OF HYPERKALEMIA IN ADULTS ⤷  Start Trial
Astrazeneca LOKELMA sodium zirconium cyclosilicate FOR SUSPENSION;ORAL 207078-002 May 18, 2018 RX Yes Yes ⤷  Start Trial ⤷  Start Trial TREATMENT OF HYPERKALEMIA IN ADULTS ⤷  Start Trial
>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 11,738,044

Country Patent Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Argentina 106369 ⤷  Start Trial
Australia 2016338753 ⤷  Start Trial
Brazil 112018007189 ⤷  Start Trial
Canada 3000950 ⤷  Start Trial
Chile 2018000916 ⤷  Start Trial
>Country >Patent Number >Estimated Expiration >Supplementary Protection Certificate >SPC Country >SPC Expiration

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