Patent Drawing in Brussels.

A patent drawing Brussels applicants file carries more weight than it does almost anywhere else in Europe, for one structural reason: Belgium does not examine patents on the merits. The Belgian Office for Intellectual Property grants irrespective of what the search turns up, so nobody at the national office is going to argue with your disclosure before it issues. The first serious reading your figures get is either at the European Patent Office, which performs the search, or in the Brussels Enterprise Court, which holds exclusive national jurisdiction when the patent is attacked. PerspireIP prepares figures for inventors, in-house teams and outside counsel across Brussels at a flat $25 per drawing, camera-ready in three to five business days.

Which rules govern a patent drawing Brussels applicants file

Brussels portfolios almost never run a single route. The city hosts the EU institutions, a dense pharmaceutical and chemicals cluster, and the headquarters functions of companies that file in Belgium, at the EPO and internationally at the same time. Four rule books are in play.

• Belgian national filing at OPRI/DIE — the Office for Intellectual Property (Office de la Propriété Intellectuelle / Dienst voor de Intellectuele Eigendom), part of the FPS Economy, under Book XI of the Code of Economic Law.
• International filing under the PCT — Rule 11 of the Regulations under the PCT governs sheet size, margins, line quality, lettering and reference signs.
• European filing at the EPO — formalities are now set by a Decision of the President of the EPO rather than by the Implementing Regulations.
• US national phase — 37 CFR 1.84, which overlaps with PCT Rule 11 but is not identical to it.

PCT Rule 11 is the useful common denominator. The concrete numbers worth memorising: A4 sheets, margins of 2.5 cm top, 2.5 cm left, 1.5 cm right and 1.0 cm bottom, a usable surface no greater than 26.2 cm by 17.0 cm, durable black uniformly thick lines without colouring, and numerals no smaller than 0.32 cm high. Every reference sign in the figures must also appear in the description, and the same feature must carry the same sign throughout.

Build to that standard once and the same set clears OPRI, survives the EPO search and needs only minor attention before a US national-phase entry.

Belgium grants without examining, so nobody corrects your figures

This is the fact that most distinguishes Brussels from Munich, Paris or Stockholm, and it is routinely misunderstood.

OPRI does not examine patentability on the merits. A novelty search is performed by the European Patent Office, which produces a search report and a written opinion, but that opinion is not binding on OPRI and the patent is granted irrespective of the result. The search fee is payable within thirteen months of filing, and once formalities are complete the patent is granted by ministerial decree as soon as possible after the eighteen-month publication point.

For drawing work the consequence is direct and uncomfortable. In a jurisdiction with substantive examination, a weak figure set usually produces an objection that forces a fix while the case is still cheap to fix. In Belgium it produces a granted patent with a weak figure set. The defect is preserved, not corrected, and it surfaces years later when the patent is asserted.

There is still an examiner reading your figures, though — the EPO examiner conducting the search. A figure set that is technically compliant but hard to read costs you twice: once in the quality of the search report you will rely on for the next thirty months, and again in the written opinion that anyone performing due diligence on the patent will eventually read.

The practical rule for Brussels filings: treat the figures as if they were going to a rigorous examiner, because the one office that scrutinises them has no power to make you fix them.

Three official languages make text in figures expensive

Belgium operates in Dutch, French and German, and the procedural language for a Belgian filing is determined by regional administrative rules rather than by the applicant’s preference. A Brussels applicant does not simply choose.

The description may be filed in another language, English included, provided a translation into the prescribed national language is supplied within three months of receipt. That concession covers the text of the application. It does not make lettering inside your figures free.

Every word baked into a drawing is a word that has to be translated, re-typeset and re-checked in the translated sheets, and any divergence between the two versions is an inconsistency an opponent can use. PCT Rule 11.11 already bars text matter in drawings except single words when absolutely indispensable; in a trilingual jurisdiction that restriction is a cost control as much as a formality.

The working method is to push meaning into reference numerals and the description, and to keep figures as close to wordless as the disclosure allows. Block diagrams and flowcharts get a practical exception because they cannot be read otherwise, but even there the label belongs in the description wherever a numeral can carry it.

One related point for European patents: since 1 January 2017 Belgium no longer requires a translation of the specification to validate a European patent granted in English, French or German. A translation of the claims is still required to establish provisional protection from a pending European application.

Where Brussels patent disputes are actually heard

Belgium concentrates patent litigation in a single city, and that city is Brussels.

Since 1 January 2015 the Brussels Enterprise Court has held exclusive first-instance jurisdiction over patent matters for the whole of Belgium, covering both infringement and validity. In practice the two travel together: an accused infringer will normally counterclaim for revocation, so the same bench that reads your figures for infringement reads them again for sufficiency and added matter. Appeals lie exclusively to the Brussels Court of Appeal.

Brussels is also the seat of a local division of the Unified Patent Court. Belgium ratified the UPC Agreement on 6 June 2014, and the Brussels local division accepts Dutch, French, German and English as languages of proceedings — unusually broad, and a genuine convenience for a portfolio drafted in English.

The drawing angle here is practical rather than formal. Because Belgium grants without merits examination, revocation proceedings are where Belgian patents are genuinely tested, and figures are central to that test. Reference numerals that are inconsistent between figures, numerals that appear in a drawing but never in the description, or a figure that shows a structural detail the description never explains are exactly the ambiguities an opponent builds an added-matter or insufficiency argument around.

Figures filed for formalities compliance in 2026 are the figures a Brussels judge construes in 2032. They are litigation documents from the day they are filed.

What Brussels industries need from their figures

The Belgian filing profile is dominated by pharmaceuticals and vaccines, fine and specialty chemicals, medical devices, logistics technology and the regulatory and standards work that follows the EU institutions. Each produces a recognisable drawing problem.

• Pharma, vaccines and biotech. Belgium’s vaccine and biologics cluster generates figures that are mostly data: assay results, chromatograms, electrophoresis gels and histology. Under 37 CFR 1.84(b)(1) photographs are accepted in the US only where they are the only practicable medium, and PCT Rule 11.13(a) still requires black lines without colouring — so a colour micrograph needs a deliberate plan, not a late petition.
• Chemicals and process engineering. Process flow diagrams and reactor schematics carry the disclosure. The recurring failure is crowding: a plant schematic shrunk to fit one A4 sheet fails the PCT Rule 11.13(c) test that the figure remain legible when reduced to two-thirds. Split the view rather than thin the lines.
• Medical devices. Device cross-sections need oblique hatching that does not obscure reference signs, which usually means breaking the hatch where a numeral sits rather than running a lead line through dense fill.
• Logistics and transport technology. Serving the Port of Antwerp-Bruges corridor and Brussels Airport, these filings lean on system and network diagrams where the same component recurs across many figures. Reference-sign consistency across sheets is the whole battle.

Design protection runs on a separate track. Belgian designs are protected through the Benelux system administered by the Benelux Office for Intellectual Property, or as a registered Community design at the EUIPO. Design figures follow different conventions from utility figures — broken lines to disclaim environment, consistent surface shading to show contour — and the two sets should be produced together rather than adapted from one another.

The EPC formalities have moved, and Rule 46 EPC is gone

A large share of Belgian protection arrives through the European route, so this matters for almost every Brussels portfolio.

As part of the EPO’s digital transformation package, Rule 46 EPC was deleted together with Rule 49(3) to (12) EPC with effect from 1 February 2023, and Rules 49(2), 50, 57(i) and 82(2) EPC were adapted to match. The substance moved into a Decision of the President of the EPO published in the Official Journal, so presentation requirements can be updated as filing technology changes without amending the Implementing Regulations. Any guide still telling a Brussels applicant to build to Rule 46 EPC is out of date.

Then the substance changed. Since 1 October 2025 the EPO accepts drawings filed by electronic communication in colour or greyscale, provided they are sufficiently rich in contrast and display clearly at 300 dpi. Colour is confined to the drawings; the description, claims and abstract remain black and white.

There is a trap for the Euro-PCT route, which is how most Belgian pharmaceutical filings reach the EPO. The colour concession does not amend the PCT. Rule 11.13(a) still requires black lines without colouring in the international phase, and the EPO will work from a colour version of a Euro-PCT application only where colour drawings are available on PATENTSCOPE and the international publication says so.

The safe approach for a mixed Belgian portfolio is unchanged: draft in line art that carries the full disclosure in black and white, and treat colour as an EPO-specific enhancement rather than the master version.

How PerspireIP delivers patent drawing Brussels work

Send whatever you have. Hand sketches, CAD exports in STEP or DWG, photographs of a prototype, assay outputs, or just the draft specification and claims. The figure set is rebuilt as vector line art rather than traced from a raster source, which is what keeps it compliant at any reproduction scale.

1. Send your material and name the filing routes — OPRI, PCT, EPO, US, or a combination.
2. A draftsperson builds the figure set to the strictest applicable standard, normally PCT Rule 11.
3. Reference signs are cross-checked against the description so that every numeral in a figure appears in the text and stays consistent across figures.
4. You receive camera-ready sheets in three to five business days, in PDF and editable vector format.
5. Revisions are included until the figures clear formalities, including redrafting in response to an objection.

Pricing is a flat $25 per drawing sheet, with no separate charge for the reference-sign audit or for revisions. For a Brussels portfolio running Belgian, European and international filings in parallel, one compliant master set feeding every route is materially cheaper than three sets produced to three standards.

Because Belgium grants without merits examination, the reference-sign audit is the part Brussels clients value most. It is the check the national office will never perform for you, and the one a revocation claimant will perform very carefully.

IP Landscape & Resources in Brussels

Key intellectual-property authorities and venues relevant to Brussels:

• OPRI/DIE (Belgian Office for Intellectual Property) — the Belgian national office, part of the FPS Economy, which grants without merits examination
• WIPO — PCT Rule 11 — the physical requirements every international drawing sheet must meet
• European Patent Office — European filings, the Belgian national search, and current presentation requirements
• Unified Patent Court — the Brussels local division, which accepts Dutch, French, German and English

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