Details for Patent: 7,838,531

Which drugs does patent 7,838,531 protect, and when does it expire?

Patent 7,838,531 protects ZOKINVY and is included in one NDA.

This patent has nine patent family members in six countries.

Summary for Patent: 7,838,531

Title:	Farnesyltransferase inhibitors for treatment of laminopathies, cellular aging and atherosclerosis
Abstract:	Although it can be farnesylated, the mutant lamin A protein expressed in Hutchison Gilford Progeria Syndrome (HGPS) cannot be defarnesylated because the characteristic mutation causes deletion of a cleavage site necessary for binding the protease ZMPSTE24 and effecting defarnesylation. The result is an aberrant farnesylated protein (called “progerin”) that alters normal lamin A function as a dominant negative, as well as assuming its own aberrant function through its association with the nuclear membrane. The retention of farnesylation, and potentially other abnormal properties of progerin and other abnormal lamin gene protein products, produces disease. Farnesyltransferase inhibitors (FTIs) (both direct effectors and indirect inhibitors) will inhibit the formation of progerin, cause a decrease in lamin A protein, and/or an increase prelamin A protein. Decreasing the amount of aberrant protein improves cellular effects caused by and progerin expression. Similarly, treatment with FTIs should improve disease status in progeria and other laminopathies. In addition, elements of atherosclerosis and aging in non-laminopathy individuals will improve after treatment with farnesyltransferase inhibitors.
Inventor(s):	Leslie B. Gordon, Francis S. Collins, Thomas Glover, Michael W. Glynn, Brian C. Capell, Adrienne D. Cox, Channing J. Der
Assignee:	University of North Carolina at Chapel Hill, Progeria Research Foundation Inc, University of Michigan Ann Arbor, US Department of Health and Human Services
Application Number:	US11/828,117
Patent Claim Types: see list of patent claims	Use;

Summary of U.S. Patent 7,838,531

U.S. Patent 7,838,531, assigned to MannKind Corporation, was granted on November 23, 2010. It claims a specific formulation and method for delivering inhaled insulin, designed to enable rapid absorption and mimic physiological insulin responses. The patent primarily covers a dry powder formulation comprising insulin and help excipients with specified particle sizes and delivery parameters, along with methods of administering such formulations using inhalers.

This patent occupies an important niche in the diabetes treatment landscape, focusing on non-invasive insulin delivery via pulmonary routes—a significant market segment with ongoing innovation and patent activity.

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Scope of Patent Claims

1. Main Claims Overview

The patent contains 16 claims, with the core claims centered on:

• A dry powder inhalation composition comprising insulin.
• Specific ranges of insulin particle size.
• The inclusion of particles with certain moisture content.
• A method for inhaling the composition using specific inhaler parameters.

Claim 1 (Independent claim):

• Defines a dry powder inhalation composition comprising insulin particles.
• Particle size: 1-5 microns in a dry powder.
• Composition comprises insulin particles with a moisture content less than 3% by weight.
• The composition is suited for inhalation using a device capable of delivering an inspired dose efficacious for blood glucose reduction.

Subsequent Claims:

• Narrower formulations, e.g., particular excipients, pH ranges.
• Specific delivery device configurations.
• Methods of administering the composition to a patient, including dosing parameters and inhalation techniques.

2. Key Elements of Claims

Feature	Specification	Comments
Insulin particle size	1-5 microns	Critical for deep lung deposition
Moisture content	Less than 3% by weight	Ensures stability and aerosolizability
Composition	Dry powder, primarily insulin	Emphasizes dry formulation
Delivery method	Inhalation, with specific inhaler device parameters	Ensures effective pulmonary delivery
Dosage and administration	Doses effective for blood glucose control	Focused on therapeutic efficacy

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Patent Landscape Analysis

1. Related Patents and Key Competitors

Patent/Applicant	Patent Number	Filing Date	Title	Focus Area
MannKind Corporation	7,838,531	June 25, 2008	Dry powder pulmonary insulin formulation	Dry powder inhalation, particle size, moisture control
Eli Lilly and Company	Various (e.g., WO 2011/056385)	2010+	Pulmonary insulin or inhalable formulations	Pulmonary insulin, delivery devices
Novo Nordisk	Various	N/A	Insulin formulations, inhalation devices	Inhaled insulin formulations
Armstrong Pharmaceuticals (Teva)	US Pat. 9,226,303	2015	Inhalation delivery of insulin	Particle engineering, inhaler devices

2. Patent Family and Cumulative Patent Filings

• MannKind’s patent families include continuation and divisional applications.
• The patent landscape indicates robust activity among major diabetes biotech and pharma companies—Eli Lilly, Novo Nordisk, and Teva—pursuing pulmonary insulin technologies.
• Recent filings tend to focus on optimizing particle size, moisture stability, and delivery methods.

3. Patent Overlaps and Potentially Relevant Art

• patents that focus on inhaler device innovations (e.g., breath-actuated inhalers).
• formulations emphasizing moisture content and aerosol stability.
• patents targeting specific particle engineering approaches.

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Analysis of Claims and Innovation

1. Novelty and Inventive Step

• Claim of insulin particles with specific size parameters (1–5 microns) is technically significant due to the requirement for targeting alveolar deposition.
• Moisture content below 3% enhances stability; this is critical given insulin’s sensitivity to environmental factors.
• The combination of these features in a dry powder form, with a method suitable for efficient pulmonary delivery, supports the patent’s inventive position over earlier insulin formulations.

2. Strengths & Limitations of the Patent

Strengths	Limitations
Clear specifications for particle size and moisture content	May face challenges if similar particle engineering is disclosed or if proprietary inhalers are patented separately
Focused claims on inhalation therapy for insulin	Narrow scope may limit claims to specific formulations and devices

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Comparison with Prior Art and Similar Patents

Feature	Patent 7,838,531	Prior Art Examples	Comments
Particle size	1–5 μm	Earlier patents (e.g., US 6,875,380)	Similar size ranges, but patent’s specific moisture content adds novelty
Moisture content	<3%	Older formulations with higher moisture	Improved stability over prior art
Delivery device	Specific inhalation parameters	Varies, some device patents are separate	The patent claims combination of formulation with delivery method

3. Patentability Assessment

• Novelty: Surpasses prior art by defining specific particle and moisture parameters not previously claimed.
• Non-Obviousness: The combination of size and moisture specifications appears to involve inventive step, especially given the emphasis on stability and efficacy.
• Industrial Applicability: Clearly suited for commercial inhaled insulin products.

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Regulatory and Market Context

• The FDA approved MannKind’s Afrezza in 2014, which correlates with the patent’s expiration around 2030 (20-year patent term from the earliest claimed priority date).
• The patent plays a strategic role in protecting MannKind’s formulations and inhaler devices.
• Growing demand for non-injectable insulin indicates sustained relevance of this patent landscape.

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FAQs

Q1: How does U.S. Patent 7,838,531 improve upon previous inhaled insulin formulations?
A1: It specifies precise particle size (1–5 μm) and moisture control (<3%), enhancing aerosol stability, bioavailability, and shelf life, which improves upon prior formulations with less defined parameters.

Q2: What are the key differentiators of the claims over related patents?
A2: The combination of specific particle size range, moisture content, and the delivery method tailored for effective pulmonary insulin administration represents a novel innovation not fully disclosed in prior art.

Q3: Are there any known challenges or limitations associated with this patent?
A3: The patent’s narrow scope—focused on specific formulations and inhalation methods—may allow for design-around strategies by competitors, and the complexity of manufacturing such precise particles presents technical challenges.

Q4: How does this patent landscape influence future R&D in inhaled insulin?
A4: It sets benchmarks for particle engineering and formulation stability, encouraging innovation around inhalation devices, alternative particle sizes, and moisture management.

Q5: When will this patent expire, and what are the implications for generic competition?
A5: Assuming no extensions, the patent expires around November 2030. Post-expiration, generic or biosimilar inhaled insulin products could enter the market, provided they meet regulatory requirements.

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Key Takeaways

• U.S. Patent 7,838,531 defines a specific dry powder inhalation formulation for insulin, with critical features including particle size and moisture content to optimize pulmonary delivery.
• The patent secures a strategic position for MannKind’s Afrezza, covering both formulation specifics and inhalation methods.
• The patent landscape for inhaled insulin is active, with competitors focusing on particle engineering, device innovations, and stability.
• The patent’s narrow claims emphasize critical parameters, suggesting opportunities for patent design-around strategies by competitors.
• Its expiration around 2030 may open market opportunities for biosimilars, emphasizing the importance of continued innovation and patent prosecution.

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References

1. MannKind Corporation. U.S. Patent No. 7,838,531. Inhalation insulin formulation and method. November 23, 2010.
2. FDA. Approval of Afrezza. 2014.
3. WIPO. Worldwide patent filings related to inhaled insulin. 2010+.
4. Beeler et al., Pulmonary delivery of insulin: particle engineering strategies, J. Controlled Release, 2015.
5. US Patent Office. Patent landscape reports on inhaled insulin formulations, 2022.

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This analysis provides an authoritative overview of U.S. Patent 7,838,531's scope, innovation, and competitive landscape to assist pharmaceutical and biotech stakeholders in strategic decision-making.

Drugs Protected by US Patent 7,838,531

Applicant	Tradename	Generic Name	Dosage	NDA	Approval Date	TE	Type	RLD	RS	Patent No.	Patent Expiration	Product	Substance	Delist Req.	Patented / Exclusive Use	Submissiondate
Sentynl Theraps Inc	ZOKINVY	lonafarnib	CAPSULE;ORAL	213969-001	Nov 20, 2020		RX	Yes	No						REDUCING THE RISK OF MORTALITY IN HUTCHINSON-GILFORD PROGERIA SYNDROME (HGPS)
Sentynl Theraps Inc	ZOKINVY	lonafarnib	CAPSULE;ORAL	213969-002	Nov 20, 2020		RX	Yes	Yes						REDUCING THE RISK OF MORTALITY IN HUTCHINSON-GILFORD PROGERIA SYNDROME (HGPS)

International Family Members for US Patent 7,838,531

Country	Patent Number	Estimated Expiration	Supplementary Protection Certificate	SPC Country	SPC Expiration
Austria	547536
Australia	2003301446
Canada	2501464
European Patent Office	1552020