When one invention heads to multiple patent offices, the drawings look like the solved part of the project: they exist, they were professionally made, surely they just travel. They don't. Only one layer of a drawing set is portable — the disclosure itself. The sheets, the embedded language, and the e-filing packaging are per-office output and get rebuilt every time.
The most expensive version of this mistake has nothing to do with drawing quality. A contract illustrator delivers tidy PDFs formatted for one office, the vector source stays with the illustrator, the project closes — and the applicant owns output, not a master. Every later jurisdiction then starts with a paid re-commission or a rebuild.
This guide covers what actually transfers, how to build a master file worth reusing, what each office checks separately, and two prompts you can run directly in the PatentFig AI generator.
Every office formats differently; the disclosure underneath is what a master file preserves.
Quick answer: the disclosure master travels, the filing files don't
| Layer | What it contains | Across borders |
|---|---|---|
| Geometry | Parts and how they relate: what holds what | Reuse as-is, frozen |
| View logic | Which figure is the perspective, section, exploded view, and why | Reuse as-is |
| Numeral map | 14 = clamp body, 32 = insert — in every figure, every country | Reuse as-is |
| Vector source | Editable linework, ideally numerals on their own layer | The one true master |
| Sheet + margins | Paper size, blank margins, layout | Regenerate per office |
| In-figure language | Text labels inside the drawings | Regenerate per office |
| E-filing wrapper | File format and submission packaging | Regenerate per office |
One hard rule: the top four layers are disclosure. If someone "improves" a cross-section while reformatting for another office, that stopped being formatting — new matter is an attorney conversation, not a layout decision.
Common mistakes
1. Treating the US filing set as the master
A US-first applicant's letter-size PDFs are the most localized artifact in the whole project, not the asset. Reusing them abroad means prying content out of a frozen layout, office after office.
2. English labels inside the figures
"Clamp body," "spring seat" — every embedded word is a translation-and-relayout bill in every non-English jurisdiction. A numeral pointing at the same part works in Portland, Beijing, and Tokyo without anyone touching the artwork.
3. No source-file clause in the illustration contract
Asking for editable vector source at signing costs almost nothing. Asking after the project closes starts with a new quote. If all you hold is a flattened PDF, you own a photograph of your drawings, not the drawings.
4. Running a utility checklist over a design application
In a design filing the drawings largely are the claim. Solid versus broken lines, view sets, shading conventions — separate rulebook, separate files, separate review. Mixing the two checklists can quietly cost scope.
What the USPTO itself expects
The US rules live in 37 CFR 1.84 and MPEP 608: letter-size or A4 sheets; top and left margins of at least 2.5 cm, 1.5 cm on the right, 1 cm at the bottom; reference characters at least 0.32 cm tall; durable black lines.
MPEP 608 is forgiving in one specific way: drawings that miss a formal requirement can still move through examination if they stay readable and reproducible. Useful safety net, terrible habit to export — that tolerance is USPTO practice, and no other office promised it to you.
A USPTO-ready sheet is one output profile of the master, not the master itself.
Building the master: PCT Rule 11 as the common denominator
The moment a second jurisdiction is plausible, build the master against PCT Rule 11 — it reads like a lowest common denominator on purpose:
- A4 sheets with prescribed blank margins;
- durable black lines that survive reduction;
- one numeral per feature, consistent across all figures, matching the description in both directions;
- words in the figures only where genuinely indispensable.
The last rule is where the reuse economics live. Strip labels to numerals once, move the meaning into the specification, and the linework enters a Chinese or Japanese filing untouched. An A4 template with the Rule 11 margin guides already drawn in (plus a US-letter twin, SVG and PDF) is on the resources page.
If the master is lost — or never existed — rebuild it: feed the old filing PDFs page by page, plus CAD screenshots, into patentfig.ai/generate. Swap embedded labels for numerals in plain chat, regenerate only the figures that come out wrong, then export SVG from /vectorize as the real master. Version history shows exactly what changed between office exports, and a pass through the figure checker catches margin and numbering slips before counsel bills for them.
What each foreign office checks separately
China (CNIPA). Any text left in the figures must be Chinese. Separately, CNIPA has been moving electronic filing toward XML-based application documents, with specification drawings on the published document list — sheets can be visually identical to the PCT set and the submission bundle still has to be regenerated under the current spec. Local counsel handles it, but only if you can hand over editable source.
Japan (JPO). Figure numbering is checked against the brief description of drawings, and design applications follow a dedicated design drawing guide — a separate document because the drawings define the scope.
Korea (KIPO). Alignment between figures, numerals, and the Korean specification, packaged to the current e-filing requirements.
Keep no foreign margin numbers in your head. Those live with local counsel and each office's current official texts. For an index of the differences, the drawing standards page links to the primary sources.
Prompts to copy
Prompt 1 — rebuild an editable master from an old filing (swap in your own invention):
The uploaded files are the 11 filed PDF sheets of a US utility application for a handlebar phone mount, plus CAD screenshots of the product. Rebuild an editable patent line-drawing master of 5 figures: FIG. 1 perspective view, FIG. 2 side elevation, FIG. 3 cross-section through the clamp, FIG. 4 exploded view, FIG. 5 mounting flowchart. Requirements: pure black lines on white, no shading or gray fills; keep the original reference numerals (14 = clamp body, 20 = hinge, 32 = damping insert, 40 = spring seat) identical across all views; remove every English word inside the figures and replace each with its numeral and a lead line; lay out on A4 with at least 2.5 cm blank at top and left, 1.5 cm right, 1 cm bottom.
Prompt 2 — export a US-ready set from that master:
From the handlebar-mount master above, export a USPTO-ready set: US letter sheets, top and left margins at least 2.5 cm, right 1.5 cm, bottom 1 cm; reference characters at least 0.32 cm tall; figure labels as "FIG. 1", "FIG. 2" and so on; numerals identical to the master, no structure added or removed; output high-resolution files for filing plus one SVG vector source for the archive.
Pre-filing checklist
- You hold editable vector source, not just PDFs
- Numeral map is consistent across all figures and matches the specification both ways
- In-figure text is down to the genuinely indispensable
- Target-office language swap is complete
- Margins come from a template, not eyeballing
- E-filing packaging confirmed by local counsel against the current spec
- Design-patent figures kept in separate files with their own review
FAQ
Can one drawing set be filed at five offices with zero changes?
No. What stays unchanged is the disclosure — geometry, view logic, numeral map. Sheets, in-figure language, and e-filing packaging are rebuilt per office. Anyone promising zero changes is treating one office's output as the master.
Which system should the master follow?
PCT Rule 11. It is the deliberate common denominator, and its minimal-text rule is the single highest-value habit for international work. Exception: if the invention will only ever see one office, format for that office and move on.
Why not maintain five national source sets?
Five independent masters means numeral drift by the third revision and no record of which file holds the approved disclosure. One master, five outputs, each validated locally — less total work and a clean audit trail.
What if the illustrator won't release the source files?
Rebuild rather than renegotiate: old PDFs plus CAD screenshots are enough to reconstruct an editable set, and the numeral map carries over. Then put a source-delivery clause in the next contract.
Start your master here: patentfig.ai/generate.
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