International Comparison
How the US 3PPS system contrasts with Third-Party Observation mechanisms in other major patent jurisdictions.
The US 3PPS (sometimes called a "US Third-Party Observation" internationally) is the most restrictive system — facts only, brittle timing, and a small fee. The EPO and PCT allow legal arguments and are free. Consider parallel filings in multiple jurisdictions.
Side-by-Side Comparison
| Feature | US (3PPS) | EPO (Europe) | PCT / WIPO |
|---|---|---|---|
| Mechanism Name | Third-Party Preissuance Submission | Third-Party Observations (TPO) | Third-Party Observations |
| Governing Rule | 35 U.S.C. § 122(e) |
Article 115 EPC | Rule 67bis PCT |
| Cost | $180 per 10 items (free for first 3) | Free | Free |
| Timing | Brittle. Before NOA and within 6 months of pub or first rejection. | Flexible. Any time after publication until decision to grant. | Any time after publication until 28 months from priority date. |
| Content Rules | Strict. Facts only. No legal arguments. | Arguments allowed. You can explain why the patent is invalid. | Arguments allowed (brief explanation of relevance). |
| Anonymity | Allowed. | Allowed. | Allowed. |
US 3PPS: The Most Restrictive System
The US 3PPS — sometimes referred to internationally as a US Third-Party Observation — is arguably the most restrictive system of the major jurisdictions. The "No Argument" rule (37 CFR 1.290(d)(3)) trips up many filers — in the US, you can load the gun for the examiner, but you cannot pull the trigger. You cannot tell the examiner the patent should be rejected; you can only show them where the prior art is.
The brittle timing window compounds this difficulty. Unlike the EPO, where you can observe at any time until the decision to grant, the USPTO window can close without notice the moment a Notice of Allowance is issued.
EPO: Third-Party Observations (Article 115 EPC)
The EPO allows third parties to file observations at any point after publication until the patent is granted. Crucially, the EPO allows arguments — you can explain to the examiner not just what a reference shows, but why it means the claim should be rejected.
EPO Third-Party Observations are free and widely used. The Applicant is formally notified and has the right to respond, making the system somewhat more adversarial in structure despite costing nothing.
PCT / WIPO: Rule 67bis Observations
The Patent Cooperation Treaty allows third-party observations to be submitted to WIPO's international bureau, typically up to 28 months from the priority date. These are forwarded to designated national and regional offices for consideration during national phase examination.
PCT observations allow brief arguments and are free to file. Effectiveness depends on whether the receiving national office has a mechanism to incorporate them — which varies significantly by jurisdiction.
Why the Difference?
The divergence reflects a deliberate policy choice by the US Congress when drafting the AIA. The legislative history makes clear that Congress wanted to improve prior art quality without creating a mechanism for third parties to harass applicants with lengthy legal briefs.
The "facts only" rule was designed to prevent 3PPS from becoming a mini-trial. The goal was simply to improve search quality — not to create an adversarial pre-grant proceeding.
If you're operating in Europe as well as the US, consider filing parallel observations under Article 115 EPC where you can make the full legal argument the USPTO won't let you make.
If the application has parallel filings in multiple jurisdictions, there may be opportunities to file observations in the EPO or other jurisdictions with more permissive content rules — even if the US window has closed. Each jurisdiction's filing is independent.