Tekna Plasma Systems Inc. v. AP&C Advanced Powders & Coatings Inc.

Tekna Plasma Systems Inc. v. AP&C Advanced Powders & Coatings Inc.

The court held that the pivotal claim element—"depletion layer"—was a coined, essential term that the patents and common general knowledge failed to define or provide an objective, reproducible method to measure in most claims. Because a POSITA could not reliably determine whether a particle possessed a depletion layer as claimed, the claims (all claims of Canadian Patent 3,003,502 and most claims of Canadian Patent 3,051,236) were invalid for ambiguity (and relatedly insufficient). A small subset of claims in the '236 patent that set an objective boundary (the 50%‑of‑maximum normalized concentration depth metric and specific depth thresholds) were held valid, but AP&C failed to prove...

Citation
2024 FC 871
Parties
Plaintiff / Defendant by Counterclaim: Tekna Plasma Systems Inc.; Defendant / Plaintiff by Counterclaim: AP&C Advanced Powders & Coatings Inc.
Court
Federal Court
Jurisdiction
Canada
Judgment Date
7 June 2024
Procedural Posture
Patent Infringement and Validity / Liability Phase, Trial (bifurcated)
Outcome
Tekna’s action granted declaring invalidity and non‑infringement in respect of Canadian Patent 3,003,502; AP&C’s counterclaim dismissed; Tekna’s counterclaim re Canadian Patent 3,051,236 granted in part (most claims invalid); a limited subset of claims in Canadian Patent 3,051,236 held valid; no claim of either...
Legal Topics
Claim Construction, Ambiguity and Insufficiency, Infringement, Validity (utility and Overbreadth), Expert Evidence, Analytical Testing (to F‑sims, Tem‑eds)
Source Language
English
Patent Law Intellectual Property Civil Litigation Evidence Claim Construction Ambiguity and Insufficiency Infringement Validity (utility and Overbreadth) +2 more

Case Brief

Summary, issues, holding and outcome

More case intelligence is available

Unlock the full research layer for this judgment.

Full judgment text Legal principles 6 Authorities cited 10 Party arguments 2 Amounts and remedies 1
Sign in to unlock

Parties

Tekna Plasma Systems Inc.

Plaintiff / Defendant by Counterclaim

AP&C Advanced Powders & Coatings Inc.

Defendant / Plaintiff by Counterclaim

Procedural Posture

Patent Infringement and Validity / Liability Phase, Trial (bifurcated)

Legal Issues

  1. 1 Proper construction of the term "depletion layer" and related claim language
  2. 2 Whether claims meet Patent Act s.27(4) requirement to define subject‑matter distinctly and explicitly
  3. 3 Whether the patents disclose sufficient information to enable assessment of claimed depletion layer (insufficiency)

Ratio Decidendi

The court held that the pivotal claim element—"depletion layer"—was a coined, essential term that the patents and common general knowledge failed to define or provide an objective, reproducible method to measure in most claims. Because a POSITA could not reliably determine whether a particle possessed a depletion layer as claimed, the claims (all claims of Canadian Patent 3,003,502 and most claims of Canadian Patent 3,051,236) were invalid for ambiguity (and relatedly insufficient). A small subset of claims in the '236 patent that set an objective boundary (the 50%‑of‑maximum normalized concentration depth metric and specific depth thresholds) were held valid, but AP&C failed to prove...

Court Disposition

Tekna’s action granted declaring invalidity and non‑infringement in respect of Canadian Patent 3,003,502; AP&C’s counterclaim dismissed; Tekna’s counterclaim re Canadian Patent 3,051,236 granted in part (most claims invalid); a limited subset of claims in Canadian Patent 3,051,236 held valid; no claim of either...

Orders

  • Canadian Patent 3,003,502 declared invalid and void; Tekna Plasma Systems Inc. declared not to have infringed Canadian Patent 3,003,502.
  • Claims 1–57, 61, 64–66, 70, 73–108, 110–114 and 118–147 of Canadian Patent 3,051,236 declared invalid and void.