Priority Chain Break and the One-Year Clock

Work through the disclosures separately because they trigger different provisions.

Competitor abstract, 10 June 2023. This is a third-party disclosure after the 3 March 2023 priority date. If the claims are properly entitled to that priority date, the abstract is not prior art at all for those claims, because the relevant date for novelty is the claim's effective filing date. The abstract only becomes a problem for claims that lose priority.

Own brochure, 5 May 2023. This is the applicant's own disclosure, before the priority date, so it is prior art unless a grace period applies. Under the Canadian Patent Act the applicant gets a 12-month grace period for disclosures made by the applicant or by someone who obtained the information from the applicant. The brochure was distributed 5 May 2023; the Canadian application was filed 14 January 2025, which is more than 12 months later. But the grace period runs from the priority date of the claim in question if priority is validly claimed, so the key question is whether the relevant claim is entitled to 3 March 2023. If it is, the brochure falls within the grace period measured from that date and is disqualified as prior art. If a claim is not entitled to priority and its effective date is the PCT filing of 20 February 2024, the brochure is still within 12 months of that date, so the grace period again rescues it. The dangerous scenario is a claim whose effective date is the Canadian national phase date of 14 January 2025 with no valid priority - then the brochure is outside the grace period and anticipates.

Evidence needed. Affidavits or declarations establishing the brochure's authorship and distribution (who prepared it, who received it, whether it was confidential), the provisional's disclosure of the septum geometry, and the PCT publication and national phase entry dates. Also confirm whether the brochure was distributed under any confidentiality obligation, which would take it out of the prior art entirely.

Practical conclusion. The geometry claims are likely safe; the durometer claim is the exposed one because it depends entirely on whether the provisional supports it.

Priority entitlement is assessed claim by claim and requires that the earlier application provide support for the claimed subject matter in the manner required for the claims themselves - the person skilled in the art must be able to derive the claimed subject matter directly and unambiguously from the earlier disclosure, using common general knowledge.

The provisional describes a septum geometry. A durometer range is a material property, not a geometric feature. Unless the provisional describes the septum material, gives a hardness value, or at least points to a class of materials with that hardness, the durometer range is not disclosed directly and unambiguously. Adding it in the PCT application is new matter relative to the provisional.

Consequence if priority fails for that claim. The effective date of the durometer claim becomes 20 February 2024 (the PCT filing date), not 3 March 2023. That shifts the prior art window by nearly 12 months. The competitor's 10 June 2023 abstract now falls before the effective date and becomes citable prior art against the durometer claim, even though it is not citable against the geometry claims. This is the classic partial-priority trap: one application, two different effective dates, and different prior art sets for different claims.

Second consequence. The durometer claim's effective date is still within 12 months of the applicant's own brochure, so the grace period still protects against the applicant's own disclosure. But the competitor's abstract is third-party and gets no grace period benefit.

Recommendation. Consider deleting the durometer claim, or narrowing it to a durometer value that the provisional arguably supports, and keep the geometry claims clean. Also check whether the durometer feature can be positioned as an inherent property of a material already named in the provisional, which is a narrower but sometimes viable argument.

At national phase entry. Amendments at entry are generally the cheapest and safest point. In Canada there is a fee tied to the number of claims, so extra claims increase the excess-claim fees, but the applicant avoids the procedural burden of a voluntary amendment later. The PCT text as filed is the starting point; amendments made at entry must not go beyond the disclosure of the international application as filed. Adding a durometer range that was never in the PCT application is new matter and will be refused regardless of timing - so the coating claim is likely fine if the PCT describes it, but the durometer range is only permissible if the PCT (not just the provisional) discloses it.

Later amendment. A voluntary amendment after entry is possible but attracts a fee, may trigger a examiner scrutiny of the amended claims, and in some cases can reopen the prior art assessment. It also costs professional time. The real risk is not the fee; it is that a late amendment drawing on matter outside the application as filed creates an invalid claim that can be attacked later.

Procedural risk to flag. Adding claims at entry does not retroactively fix the priority problem. If the durometer claim is not supported by the provisional, adding it in Canada does not change the fact that its effective date is the PCT filing. The company should decide whether the durometer claim is worth the exposure to the June 2023 abstract before paying to add it.

Cost framing. Compare (a) excess claim fees now, (b) amendment fee plus attorney time later, and (c) the cost of a validity attack on a claim with a weak priority date. Option (c) usually dwarfs (a) and (b), which argues for resolving the priority question first.