CNIPA Patent Drawing Requirements: Rules for Chinese Patent & Utility Model Filings

CNIPA patent drawing requirements set standardized formatting, content, and presentation rules for all China patent drawings, including invention, design, and Chinese utility model drawings submitted to the Chinese National Intellectual Property Administration for filing approval.

Step-by-Step Workflow to Create Compliant CNIPA Patent Drawings

Following a structured workflow ensures you meet all core CNIPA figure rules without missing critical requirements that can delay your filing. Below is an actionable, examiner-approved workflow for preparing your submission:

1. Align with base formatting specs first: All drawings must be formatted for A4 paper, with 25mm margins on the top and left, 15mm margins on the bottom and right. Use only solid black lines between 0.1mm and 0.7mm thick, no color or decorative elements, and a minimum resolution of 300 DPI for digital submissions.
2. Label all elements consistently: Use Arabic numerals for all reference signs, assigning the same number to the same part across every figure in your submission. Leader lines connecting reference numbers to parts must not cross over other drawing elements, and all labels use a clear sans serif font between 8pt and 12pt.
3. Include all required views for your filing type: For inventions and Chinese utility model drawings, include every view needed to show all novel claimed features, including cross-sections, exploded views, and enlarged detail views as relevant. For design patents, submit six orthographic views (front, back, left, right, top, bottom) plus a perspective view unless you explicitly waive a view for symmetry.
4. Follow standard figure numbering rules: Label each individual drawing below the image with the full phrase "Figure X", where X is a sequential Arabic numeral, no abbreviations like "Fig." are allowed. Do not include any explanatory text inside the drawing area itself, only reference numbers and required view markers like cross-section line labels.
5. Cross-check against your written description: Ensure every reference sign used in your drawings matches the reference signs listed in your patent specification’s description of figures section, with no mismatched numbers or missing labels for claimed features. You can use AI-assisted tools like PatentDraw to generate a working draft of your drawings aligned with base CNIPA specifications, but note that all AI output requires human technical and professional review to ensure full compliance before filing.

Concrete Example of Compliant China Patent Drawings

To make these requirements tangible, consider a 2024 Chinese utility model filing for a foldable, solar-powered wireless phone charger. Compliant drawings for this filing would meet all CNIPA patent drawing requirements as follows:

• Figure 1: Perspective view of the charger in its closed, portable configuration, with reference signs 1 for the main ABS housing, 2 for the integrated solar panel, 3 for the USB-C charging port, and 4 for the magnetic charging pad.
• Figure 2: Cross-sectional view along line A-A from Figure 1, showing internal components including the 10,000mAh battery (reference 5) and folding hinge mechanism (reference 6), with the same reference numbers used for parts already labeled in Figure 1.
• Figure 3: Perspective view of the charger in its open, in-use configuration, showing the secondary solar panel (reference 7) extended from the housing, with no background elements, shading, or brand logos included anywhere in the drawing area.

All lines in this example are 0.3mm thick, all labels are 10pt sans serif font placed outside the drawing margins, and the entire set fits within standard A4 margin requirements.

Common CNIPA Patent Drawing Mistakes That Cause Rejections

Even small deviations from CNIPA figure rules can trigger a correction notice, which delays your filing date by 2-4 weeks on average. The most frequent mistakes filers make include:

• Using color or unapproved shading: Grayscale shading, color, or textured fills are not permitted for invention and utility model filings, unless you explicitly request an exception to show a feature that cannot be clearly represented with lines alone. Color is only allowed for design patents where color is a claimed feature, and you must submit both color and black and white copies.
• Inconsistent reference signs: Using different numbers for the same part across figures, or omitting reference signs for key novel features, leads to examiner confusion and mandatory correction requests. Always cross-check all reference signs across your drawings and specification before submission.
• Including non-essential content: Brand logos, marketing text, explanatory notes, or decorative elements inside the drawing area are strictly prohibited, and will result in an immediate request to remove that content.
• Missing required views: Omitting a cross-section that shows a unique internal feature, or failing to submit all six orthographic views for a design patent, is one of the top reasons for drawing-related rejections. Always confirm required views for your specific filing type before submitting.

Frequently Asked Questions

Do CNIPA patent drawing requirements allow grayscale or color drawings?

For most invention and utility model filings, only black and white line drawings are accepted, with no grayscale shading unless it is absolutely necessary to clarify a feature that cannot be shown with lines alone. Color drawings are only permitted for design patent filings where color is a claimed feature, and you must submit both color and black and white copies with your application.

What size paper do Chinese utility model drawings require?

All China patent drawings must be formatted for A4 size paper, with 25mm margins on the top and left edges, and 15mm margins on the bottom and right edges to leave space for CNIPA administrative stamps and processing notes. Drawings cannot bleed outside these margins, and you cannot submit drawings on larger or smaller paper sizes.

Can I use abbreviations for figure labels under CNIPA figure rules?

CNIPA requires full, clear labeling for all figures, so abbreviations like "Fig." or "FIG" are not permitted, you must label each drawing with the full phrase "Figure X" where X is the sequential Arabic numeral for the drawing. Reference sign labels should also use Arabic numerals, no letters or symbols unless explicitly permitted for specific technical fields.