Zentek wins U.S. patent for ZenGUARD tech

Zentek Ltd. reports that the U.S. Patent and Trademark Office has granted U.S. Patent No. 12,616,206 for the graphene-based technology behind its ZenGUARD™ platform, including a 327-day extension to the patent term.

Accepted by SEC EDGAR 06/09/2026 - 12:08 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Zentek Ltd. reports that the U.S. Patent and Trademark Office has granted U.S. Patent No. 12,616,206 for the graphene-based technology behind its ZenGUARD™ platform, including a 327-day extension to the patent term. This builds on an issued Canadian patent that covers ZenGUARD™ use in personal protective equipment and HVAC applications, including ZenGUARD™ Enhanced Air Filters now available for sale in Canada.

The company highlights the U.S. HVAC air filter market, estimated at approximately US$5.3 billion in 2025, and notes that about 30% of HVAC energy consumption is attributed to overcoming air filter resistance. Zentek is assessing U.S. regulatory requirements, including EPA registration, and working with U.S. partner Quality Filters Inc. on a potential U.S. market entry, which remains subject to regulatory, commercial, manufacturing and market-acceptance risks. Zentek also notes its Albany graphite asset is progressing toward a Preliminary Economic Assessment targeted for completion in Summer 2026.

Key Figures

U.S. patent number: U.S. Patent No. 12,616,206 Patent term extension: 327-day extension U.S. air filter market size: US$5.3 billion +2 more

5 metrics

U.S. patent number U.S. Patent No. 12,616,206 Graphene-based technology underlying ZenGUARD platform

Patent term extension 327-day extension Extension to enforceable term to compensate for examination delays

U.S. air filter market size US$5.3 billion Estimated U.S. air filter market in 2025

HVAC energy used for filter resistance Approximately 30% Share of HVAC energy consumption attributed to overcoming air filter resistance

Albany PEA timing Summer 2026 Targeted completion of Preliminary Economic Assessment for Albany graphite asset

Key Terms

graphene-based technology, HVAC, EPA registration, Preliminary Economic Assessment, +1 more

5 terms

graphene-based technology technical

"covering the foundational graphene-based technology underlying the Company's ZenGUARD™ platform"

HVAC technical

"covering personal protective equipment and heating, ventilation and air conditioning ("HVAC") applications"

HVAC stands for heating, ventilation and air conditioning — the systems that control temperature, airflow and indoor air quality in buildings. Investors care because HVAC drives operating costs, energy use, tenant comfort and regulatory compliance; like the engine and insulation of a building, efficient modern systems can lower bills, reduce repair and replacement spending, and preserve property value, while outdated units can create unexpected expenses and vacancy risk.

EPA registration regulatory

"evaluating U.S. regulatory requirements, including EPA registration, while working alongside its U.S. manufacturing and distribution partner"

EPA registration is the U.S. Environmental Protection Agency’s formal approval that allows a pesticide, disinfectant, or similar chemical product to be marketed and sold in the United States. It matters to investors because registration determines whether a product can reach customers, what claims and labeling are allowed, and the legal and compliance costs a company must bear—similar to a product needing a passport and license before it can be sold widely.

Preliminary Economic Assessment financial

"Albany is the Company's principal critical minerals asset and is advancing toward a Preliminary Economic Assessment targeted for completion in the Summer of 2026"

A preliminary economic assessment is an initial analysis that estimates the potential profitability and feasibility of a project or resource, such as a new mineral deposit or development venture. It provides a rough idea of costs, benefits, and risks, helping investors decide whether to pursue more detailed studies. This early evaluation is important because it offers a snapshot of whether the project is worth further investment and development.

forward-looking statements regulatory

"This news release contains forward-looking statements. Since forward-looking statements address future events and conditions"

Forward-looking statements are predictions or plans that companies share about what they expect to happen in the future, like estimating sales or profits. They matter because they help investors understand a company's outlook, but since they are based on guesses and assumptions, they can sometimes be wrong.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What patent did Zentek Ltd. (ZTEK) receive for its ZenGUARD technology?

Zentek received U.S. Patent No. 12,616,206 covering the foundational graphene-based technology behind its ZenGUARD platform. The patent includes a 327-day term extension and complements an issued Canadian patent protecting ZenGUARD in PPE and HVAC applications, including ZenGUARD Enhanced Air Filters.

How does Zentek describe the U.S. air filtration market opportunity for ZenGUARD?

Zentek cites estimates that the U.S. air filter market was approximately US$5.3 billion in 2025. It notes HVAC operations are a major part of commercial building energy use, with about 30% of HVAC energy consumption used to overcome air filter resistance, a problem ZenGUARD Enhanced Air Filters aim to address.

Is Zentek Ltd. (ZTEK) ready to enter the U.S. market with ZenGUARD Enhanced Air Filters?

Zentek is evaluating U.S. regulatory requirements, including EPA registration, while working with its U.S. manufacturing and distribution partner Quality Filters Inc. Any U.S. market entry remains subject to regulatory approvals, commercial readiness, manufacturing capabilities, distribution, market acceptance and other risks, with no assurance on timing or success.

How does the new U.S. patent affect Zentek’s overall intellectual property portfolio?

The U.S. patent grant broadens Zentek’s intellectual property portfolio across its graphene-based and advanced material platforms. Management states each issued patent extends the duration and geographic scope of protection for technologies the company is advancing toward commercialization, including ZenGUARD and the Triera businesses.

What are Zentek Ltd.’s main technology platforms mentioned in this filing?

Zentek describes itself as an intellectual property development and commercialization company focused on graphene-enabled and advanced material technologies. Its core platforms are Albany Graphite, ZenGUARD and Triera, spanning clean air, next-generation materials and critical minerals applications, with Albany advancing toward a Preliminary Economic Assessment targeted for Summer 2026.

What forward-looking statement cautions does Zentek include with this announcement?

Zentek states the news release contains forward-looking statements about future events and conditions, which involve inherent risks and uncertainties. Assumptions are considered reasonable, but the company warns no assurance can be given that events will occur within disclosed time frames or at all, and disclaims any obligation to update except as required by law.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16
UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of June 2026

Commission File Number: 001-41310

ZENTEK LTD.
(Translation of registrant's name into English)

1123 York Road
Guelph, Ontario N1E 6Z1 Canada
(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☐      Form 40-F ☒

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	ZENTEK LTD.
	(Registrant)
Date: June 9, 2026	By	/s/ Wendy Ford
		Wendy Ford
		Chief Financial Officer

EXHIBIT INDEX

Exhibit		Description
99.1		News Release dated June 9, 2026

Zentek Granted U.S. Patent for ZenGUARD™

Graphene-Based Technology

U.S. Patent No. 12,616,206 granted to Zentek with 327-day term extension; complements
issued Canadian patent covering ZenGUARD™ in HVAC and PPE applications.

Guelph, ON - June 9, 2026 - Zentek Ltd. ("Zentek" or the "Company") (TSXV: ZEN) (NASDAQ: ZTEK) is pleased to announce that the United States Patent and Trademark Office has issued U.S. Patent No. 12,616,206 (the "Patent") covering the foundational graphene-based technology underlying the Company's ZenGUARD™ platform.

The Patent includes a 327-day extension to its enforceable term to compensate for examination delays. The Patent is owned by Zentek Ltd., with Dr. Seyyedarash Haddadi named as lead inventor alongside co-inventors. The Patent further strengthens the Company's intellectual property protection for ZenGUARD™, complementing its issued Canadian patent covering personal protective equipment and heating, ventilation and air conditioning ("HVAC") applications, including ZenGUARD™ Enhanced Air Filters, which the Company announced on May 6, 2026, are now available for sale in Canada.

U.S. Air Filtration Market

The U.S. is among the largest markets globally for HVAC air filtration and is several times the size of the Canadian market. The U.S. air filter market was estimated at approximately US$5.3 billion in 2025¹.

HVAC operations are a significant component of commercial building energy use, and industry estimates indicate approximately 30% of HVAC energy consumption is attributable to overcoming the resistance imposed by air filters². ZenGUARD™ Enhanced Air Filters are a graphene-based technology engineered to help address this problem by delivering enhanced air quality without imposing an energy penalty. The Company will continue evaluating U.S. regulatory requirements, including EPA registration, while working alongside its U.S. manufacturing and distribution partner, Quality Filters Inc., an established American air filter manufacturer headquartered in Robertsdale, Alabama, to potentially enter the U.S. market. Any such U.S. market entry remains subject to applicable regulatory requirements, commercial readiness, manufacturing and distribution considerations, market acceptance and other risks, and there can be no assurance that Zentek will enter the U.S. market, or as to the timing, scope or commercial success of any such entry.

The U.S. patent grant broadens Zentek's intellectual property portfolio across its graphene-based and advanced material platforms, which underpin the ZenGUARD™ and Triera businesses. Each issued patent extends both the duration and geographic scope of protection for technologies the Company is advancing toward commercialization.

Management Commentary

"The U.S. and Canadian patents now protect ZenGUARD™'s underlying graphene-based indoor air quality technology in our two priority geographies," said Mohammed (Moe) Jiwan, Chief Executive Officer of Zentek. "ZenGUARD™ was developed in response to a specific market need: air filtration that materially improves indoor air quality in commercial and institutional buildings without imposing an energy penalty. We will continue to advance ZenGUARD™ alongside Quality Filters Inc. as the U.S. regulatory pathway clarifies."

About Zentek Ltd.

Zentek Ltd. is a Canadian intellectual property development and commercialization company advancing a portfolio of graphene-enabled and advanced material technologies across clean air, next-generation materials, and critical minerals. The Company's core platforms are Albany Graphite, ZenGUARD™, and Triera. Albany is the Company's principal critical minerals asset and is advancing toward a Preliminary Economic Assessment targeted for completion in the Summer of 2026.

Forward-Looking Statements

This news release contains forward-looking statements. Since forward-looking statements address future events and conditions, by their very nature they involve inherent risks and uncertainties. Although Zentek believes that the assumptions and factors used in preparing the forward-looking information in this news release are reasonable, undue reliance should not be placed on such information, which only applies as of the date of this news release, and no assurance can be given that such events will occur in the disclosed time frames or at all. Zentek disclaims any intention or obligation to update or revise any forward-looking information, whether as a result of new information, future events or otherwise, other than as required by law.

Neither the TSX Venture Exchange nor its Regulation Services Provider accepts responsibility for the adequacy or accuracy of this release.

References (public)

1. https://www.mordorintelligence.com/industry-reports/north-america-air-filter-market

2. https://cleanair.camfil.us/2025/03/19/hvac-engineers-resource-for-low-pressure-drop-air-filters/

For more information:

Mohammed (Moe) Jiwan

Chief Executive Officer, Zentek Ltd.

T: 416-709-8876

E: mjiwan2@zentek.com

W: www.zentek.com

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 EXHIBIT 99.1 8.3 KB