Patent Drawings in Sweden: 8 Essential PRV Rules

Most jurisdictions tell you exactly how a figure sheet must look. The United States spends a long, itemised rule on it. France publishes margin ranges to the millimetre. Sweden does not. The entire statutory law on the form of patent drawings in Sweden is one sentence in section 4 of the Patents Decree: A4, dark and preferably black lines, on a light and preferably white background. That brevity is a trap rather than a gift. A thin rulebook does not mean a forgiving examiner — it means the standard you are actually held to lives somewhere other than the statute, and you have to know where to look for it.

Why Patent Drawings in Sweden Follow a Thinner Rulebook

The Swedish Intellectual Property Office — Patent- och registreringsverket, universally called PRV — is an examining office. It searches, it examines for novelty and inventive step, and it issues office actions. What it does not do is operate a dedicated drawings-review function of the kind the USPTO built around its draftspersons.

The practical consequence is that figure problems in Sweden rarely arrive as a standalone formality notice. They arrive folded into a substantive office action, or they surface later as an ambiguity in what the application actually disclosed. By that point the cheap fix has expired.

So the question worth asking is not “what will PRV reject?” but “what standard will my figures be read against in three years, when somebody is arguing about scope?” The answer is that patent drawings in Sweden are assembled from three sources rather than one, and only the first of them is law.

The Three Places Swedish Drawing Practice Actually Lives

There is no Swedish equivalent of the MPEP’s drawing chapter. Instead:

1. The Patents Decree (Patentkungörelse 1967:838), section 4 — the only binding provision on the form of the sheets. It gives you A4 and it gives you dark lines on a light background. That is the whole of it.
2. PRV’s own application guidance — the office’s published practice on what a figure may and may not contain, including the rule on text in the figures. Not a statute, but it is what the examiner applies.
3. PCT Rule 11 — the international standard. Because so much of PRV’s intake is PCT national-phase work, and because Rule 11 is the lingua franca of drawing formalities, it is the de facto specification Swedish practitioners draft to.

Drafting to PCT Rule 11 is the safe play: it is stricter than section 4 on every axis, so a Rule 11-compliant set clears Sweden automatically. Our guide to PCT drawing requirements sets out that standard in full.

Rule 1: A4, and the Format Must Survive Reproduction

Section 4 of the Decree requires the description, the accompanying drawings, the claims and the abstract to be executed in A4 format — 210 × 297 mm — and in a form suitable for reproduction.

Two things follow. The first is obvious: US Letter sheets do not belong in a Swedish filing, and a set prepared to 8.5 × 11 inches needs regenerating rather than rescaling. The second is less obvious. “Suitable for reproduction” is a functional test, not a dimensional one. A technically A4 sheet whose hairlines vanish when copied fails section 4 even though its trim size is correct.

Section 4 does not specify margins. This is the single largest gap between Swedish statute and the rules most attorneys carry in their heads, and it is why drafting to the international standard matters: PCT Rule 11.6 does specify them, and a set built to those margins is unimpeachable in Stockholm.

This is worth stating plainly because it inverts the usual advice. For most offices you check your set against the local rule. For patent drawings in Sweden there is no local rule detailed enough to check against, so the working standard has to be imported — and the only sensible import is the international one.

Rule 2: Dark, Preferably Black Lines on a Light, Preferably White Background

The statutory wording is mörka, företrädesvis svarta linjer mot ljus, företrädesvis vit bakgrund — dark, preferably black lines against a light, preferably white background. PRV’s own guidance tightens “preferably” into plain instruction: black lines on a separate A4 sheet.

Note what the provision is built on. It regulates lines. A rendering that carries its information in grey tone, gradient fill or photographic shading rather than in line work is not obviously compliant even when every pixel is technically dark-on-light. Hatching, stippling and conventional sectional shading are line techniques and travel safely; a soft grey wash does not.

If your source material is CAD output, the practical step is to export a line-art view rather than a shaded render. We walk through the conversion in what makes a high-quality patent drawing.

Rule 3: Colour Has No Route In

Colour drawings are not accepted under Swedish national law. WIPO’s PCT Applicant’s Guide states it flatly in the Swedish national chapter, and section 4’s “dark lines on a light background” leaves no room for it.

What makes this worth flagging is that Sweden now sits out of step with two neighbours an applicant deals with in the same week:

• The EPO has accepted colour and greyscale in electronically filed applications since 1 October 2025.
• The USPTO has a petition route: 37 CFR 1.84(a)(2) permits colour drawings in a utility application on a granted petition accompanied by the fee set in 37 CFR 1.17(h).
• Sweden has neither. There is no petition, no fee, no discretionary acceptance — the same position as France, where colour is barred outright.

So a single invention can need a colour set for the EPO, a petitioned colour set for the USPTO, and a black-line set for PRV. Build the black-line set first; it is the one that converts cleanly in every direction. The comparison is drawn out in our piece on colour patent drawings and, for the French position, in patent drawings in France.

Rule 4: The Figures Carry Reference Signs, Not Sentences

PRV’s guidance is specific and it is the rule most often broken. Drawings may carry numerical or alphabetical references keyed to the special part of the description. They may not carry explanatory text, with the narrow exception of short indications — the office’s own example is a single word such as “gas”.

That exception is narrower than it looks. “Gas” is a label. “Gas inlet valve assembly 14” is a sentence with a number attached, and it is the kind of annotation that gets queried. The discipline is to let the numeral do the work and let the description define it.

Reference signs also have to be used consistently: the same element keeps the same sign across every figure, and every sign on a sheet needs a counterpart in the description. Our reference numeral guide covers the numbering conventions that survive translation.

Flowcharts, step schemas and circuit diagrams are drawings for this purpose, and functional labels inside a block are normal practice in those figures. The prohibition bites on prose, not on the minimum legend a schematic needs to be readable.

Of every formality discussed here, this is the one that most often turns up in PRV correspondence. Annotating patent drawings in Sweden the way an engineering drawing is annotated — callouts, part names, assembly notes — produces a set that reads well internally and breaches the office’s practice on every sheet.

Rule 5: Drawings Belong on Their Own Sheets

The drawings are filed on sheets separate from the description, and PRV’s guidance repeats the point. The explanation of each figure belongs in the special part of the description, not alongside the figure.

This is a formality with a substantive tail. Because the brief description of the figures lives in the text and the figures live apart from it, a mismatch between the two is invisible on a quick read and expensive later: a figure described but not filed, or filed but never described, is the classic way an application ends up disclosing less than its drafter believed. The brief description of the drawings is the cross-check, and it is worth reading both lists against each other before filing.

Figures are numbered in a single sequence of their own, independent of how many sheets they occupy. One sheet can hold several figures; one figure can span sheets.

Rule 6: Choose Swedish or English Before You Draw

Sweden offers something most EPC states do not: you may prosecute, and be granted, in English. PRV asks you to decide at the outset whether the patent is to be granted in Swedish or in English, and to use that language for the description, the claims and the abstract.

Any text matter in the drawings follows the same constraint — it must be in Swedish or English. Given Rule 4, there should be very little of it, but “gas” versus “gas” is easy and a mixed-language set is avoidable embarrassment.

If you elect English, a Swedish translation of the claims is required when PRV is about to grant. Only the claims. The English claims continue to define the scope of protection; the Swedish translation is there for information. Description and drawings are never translated, which is a real cost saving over jurisdictions that demand a full translation at grant.

Practical consequence for the figures: because the description is not retranslated, a reference-sign error baked into an English filing stays exactly where you put it. There is no translation pass downstream that might catch it.

Rule 7: The PCT Route Into Sweden Is Open, at 31 Months

This matters because it is not true everywhere, and getting it wrong is the kind of error that loses rights rather than points. Sweden’s PCT national phase leads to a Swedish national patent, and the time limit is 31 months from the priority date under both PCT Article 22(3) and Article 39(1)(b).

Compare the neighbours. France and the Netherlands have closed their national routes from the PCT — in both, a European patent is the only way through. An applicant who assumes the Dutch or French position applies in Sweden gives up a national filing that was available; an applicant who assumes the Swedish position applies in France loses the deadline altogether.

On entry, the description, claims, any text matter of the drawings and the abstract must be in Swedish or English. If the translation is not on file at 31 months but the filing fee was paid in time, a two-month grace period is available against an additional fee. Before grant, the description and drawings may be amended to bring them into line with PCT requirements.

The mechanics of entry are set out in PCT national phase in Sweden, and the three routes to Swedish protection in how to file a patent in Sweden.

Rule 8: A Validated European Patent Does Not Play by Section 4

Sweden is an EPC contracting state, so the third route to protection is a European patent taking effect in Sweden. The figures in that application were examined by the EPO against the EPO’s standard, not against section 4 — and the EPO’s standard moved recently in a way many practitioners have not caught up with.

Rule 46 EPC, the provision on the form of drawings, was deleted with effect from 1 February 2023. Its content, together with Rule 49(3)–(12) EPC, was moved into a Decision of the President of the EPO. European drawing formalities now rest on Rule 49(2) EPC, that Decision, and Guidelines A-IX. Any source still citing Rule 46 EPC as live law is out of date, and there are a great many of them.

The deletion was deliberate: taking presentation requirements out of the Implementing Regulations lets the EPO change them as digital filing evolves without an Administrative Council amendment. The colour allowance from 1 October 2025 is exactly that flexibility being used.

Which produces the mismatch worth planning around. A European patent validated in Sweden can carry colour figures that PRV would never have accepted in a national filing. The drawings are not re-examined on validation. If you may want a Swedish national sibling — a divisional strategy, a utility-model-style fallback, a national filing for a feature the EP dropped — draw in black line from the start. Our note on validating a European patent in Sweden covers the validation formalities, and EPO drawing requirements covers the post-2023 position.

Where a Swedish Patent Is Enforced, and Why the Figures Decide It

Sweden consolidated its IP litigation in 2016. The Patent and Market Court (Patent- och marknadsdomstolen), seated at Stockholm District Court, has exclusive competence over intellectual property, market law and competition law. Appeals go to the Patent and Market Court of Appeal, seated at the Svea Court of Appeal in Stockholm.

Sweden is also a UPC contracting state, and it hosts something no other member does: the Nordic-Baltic Regional Division, seated in Stockholm and shared with Estonia, Latvia and Lithuania. It is the Unified Patent Court’s only regional division, and its language of proceedings is English.

Both forums read figures as disclosure. A reference sign that appears on a sheet but nowhere in the description, a figure whose brief description does not match what was filed, a sectional view whose hatching no longer distinguishes two materials after reproduction — each of those is an argument handed to the other side about what the application actually taught. Formality compliance and evidentiary strength are the same work done once.

For filings handled locally, our teams cover patent drawing services in Stockholm and Gothenburg.

Treating patent drawings in Sweden as a filing formality rather than as evidence is therefore a false economy. The Patent and Market Court is reading the same sheets PRV accepted, but it is reading them for what they disclosed to a skilled person, and that is a far less forgiving question than whether the lines were black.

Pre-Filing Checklist for a Swedish Figure Set

Run this before the set leaves your desk:

1. A4, 210 × 297 mm, every sheet — and legible after reproduction, not merely correct in trim size.
2. Black line work on white. No colour, no grey wash, no photographic tone. There is no petition route to fall back on.
3. Margins to PCT Rule 11.6 rather than to section 4, which sets none.
4. Reference signs only. No explanatory prose beyond a one-word indication of the kind PRV illustrates with “gas”.
5. Every sign on a sheet appears in the description; every element keeps one sign across all figures.
6. Drawings on sheets separate from the description, figures numbered in their own continuous sequence.
7. Language of any text matter matches the elected language of the application — Swedish or English, not both.
8. If the application is going to the EPO as well, confirm whether you are drawing to the EPO standard or to section 4, and keep the black-line master as the source of truth.

The gap between a set that clears PRV and a set that clears PRV, the EPO and the USPTO is small if you build the black-line version first and derive the rest. It is expensive if you work the other way.

Need a Swedish-Compliant Figure Set?

PerspireIP prepares figure sets to PRV, EPO, PCT and USPTO standards from a single black-line master, so the same invention files cleanly in Stockholm, Munich and Alexandria without redrawing. See our patent drawing services, or tell us what you are filing and we will tell you what the set needs.

Frequently Asked Questions