Canada Federal Court of Appeal Dismisses AP&C’s Metal Powder Patent Appeal: Claim Ambiguity Vexes Advanced Materials IP

Case Overview

The Parties

The Patents at Issue

This dispute involved two Canadian patent applications, both covering metal powder atomization manufacturing processes. These processes are critical for producing the specialized metal powders used in sectors like aerospace, medical devices, and additive manufacturing:

• • CA3051236A1 — Relating to metal powder atomization manufacturing processes
• • CA3003502A1 — Also directed to metal powder atomization technology

The specific claims at issue addressed the scope of manufacturing process parameters or configurations within plasma-based atomization systems, with the exact claim language becoming the central battleground of the litigation.

The Accused Product/Process

The alleged infringement concerned Tekna’s metal powder atomization manufacturing processes — directly competitive with AP&C’s patented methods. Given the commercial stakes in the advanced manufacturing sector, the outcome carries significant implications beyond these two parties.

Legal Representation

AP&C (Appellant): Andrew Brodkin and Ben Hackett of Goodmans LLP
Tekna (Respondent): Audrey Berteau, François Guay, and Jean-Sébastien Dupont of Smart & Biggar LLP

Both firms are prominent in Canadian IP litigation, lending the case significant professional weight.

Litigation Timeline & Procedural History

The appeal was filed on September 9, 2024 (Case No. A-274-24) at the Canada Federal Court of Appeal, following an unfavorable ruling at the Federal Court trial level. The matter closed on January 22, 2026, reflecting a proceeding duration consistent with Canadian appellate timelines for patent matters.

The procedural path is significant: AP&C first litigated and lost at the Federal Court level, where the trial judge construed the claims in issue and determined they were insufficiently defined — a finding of ambiguity. AP&C then pursued appeal, arguing that:

• The Federal Court erred in concluding ambiguity existed
• The Federal Court should have proceeded to assess insufficiency and infringement regardless

The appellate panel methodically reviewed the trial court’s reasoning on claim construction and ambiguity before dismissing all grounds of appeal. Notably, because the ambiguity finding was upheld, the Court of Appeal found it unnecessary to examine AP&C’s arguments on insufficiency and infringement — a significant procedural economy that also signals the threshold importance of clear claim drafting.

The Verdict & Legal Analysis

Outcome

The Federal Court of Appeal dismissed AP&C’s appeal in its entirety, affirming the Federal Court’s decision and ordering AP&C to pay costs fixed at an all-inclusive amount of $30,000. No infringement was found; no damages were awarded to AP&C.

Appellate Court’s Reasoning

The Court identified no error of law, no palpable and overriding error of fact, and no extricable error of law in mixed fact and law — the three recognized grounds for appellate intervention in Canadian patent proceedings. This tripartite affirmation is notable; it signals that the Federal Court’s original reasoning was not only defensible but thorough.

The Court addressed AP&C’s central appellate argument directly in paragraph [6]: AP&C contended that because the Federal Court was able to construe the claims, it could not logically conclude they were ambiguous. The Court of Appeal rejected this conflation, affirming that the ability to interpret claims does not preclude a finding that they provide “insufficient definition to understand their scope.”

This distinction — between claim constructability and claim definiteness — is a critical doctrinal point under Canadian patent law and aligns with the principle that ambiguous claims, even when interpretable in context, may fail to provide the public with adequate notice of the protected scope.

Claim Ambiguity as Dispositive Issue

Because the ambiguity finding was upheld, the Court declined to consider AP&C’s arguments on patent insufficiency and infringement — both of which were rendered moot. This is a strategically important procedural outcome: it means Tekna prevailed without the Court needing to adjudicate whether its actual processes infringed or whether the patents were otherwise invalid for insufficiency.

Legal Significance

This ruling reinforces the importance of claim clarity in Canadian patent prosecution. Under Canadian patent law, claims must define the monopoly with sufficient precision to inform the public of the boundaries of the exclusive right. Where they fail to do so, a finding of ambiguity can collapse the entire infringement case — regardless of the merits of the underlying technology or the accused process.

The decision also confirms the appellate standard: trial courts are afforded substantial deference on claim construction and ambiguity findings absent a clear extricable legal error.

Industry & Competitive Implications

The advanced metal powder sector — serving aerospace, medical devices, defense, and additive manufacturing — is intensely IP-dependent. Plasma atomization processes represent a core competitive differentiator, and patent portfolios in this space are frequently the subject of licensing negotiations and competitive monitoring.

This ruling has several practical implications for the industry:

For AP&C:

The loss represents not only a litigation setback but a potential weakening of its IP position relative to Tekna in the plasma atomization market. The invalidation of asserted claims through ambiguity leaves the door open for Tekna to continue its manufacturing processes without licensing obligations.

For Tekna:

The victory, achieved without an infringement determination, is strategically clean — no court has characterized its processes in relation to these patents, preserving operational flexibility.

For the Broader Sector:

Companies investing in metal powder and additive manufacturing IP should treat this case as a drafting benchmark. Process patents with insufficiently defined scope are vulnerable to ambiguity attack, regardless of the technological sophistication of the underlying invention.

The case also reflects a broader trend in Canadian patent litigation toward rigorous claim construction gatekeeping, consistent with courts’ dual role in protecting patentees and safeguarding public notice.