Patent Drawing Examples: 27 Annotated Samples, Views & Rules
A patent drawing is a black-and-white technical line figure in a patent application that shows how an invention works or looks — drawn with uniform solid lines on white paper, figure labels (FIG. 1, FIG. 2), and reference numerals connected to each part by leader lines. Browse 27 annotated examples across eight categories below, with before/after source pairs, USPTO 37 CFR 1.84 rules, and prompts you can adapt in the generator.
- 27 annotated figures
- Before/after source pairs
- USPTO 37 CFR 1.84 checklist
- Utility, design & diagram views
The 30-second answer: what a patent drawing is
- A patent drawing is black-and-white line art on white paper that illustrates an invention: utility drawings label every claimed part with a reference numeral and leader line, while design drawings show ornamental appearance across a consistent view set with no numerals.
- Under USPTO 37 CFR 1.84, figures use solid black lines of uniform weight, numbered views (FIG. 1, FIG. 2), numerals at least 0.32 cm (1/8 in) tall, standard sheet margins, and line or stipple shading rather than gray fills or photographs.
- To make one, open the closest example below to pre-fill the generator — or upload a photo, sketch, screenshot, or 3D model — then validate margins, DPI, line weight, and numerals in the figure checker before filing.
Sample patent drawings by category
Each sample is a fictional invention. Cards marked with a source image show the before/after: what went in, and the patent figure that came out.
Utility patent drawings
Utility figures show how an invention works. Every functional part gets a reference numeral with a leader line, and the same part keeps the same numeral across every view.
Design patent drawings
Design figures show ornamental appearance across a consistent view set — front, rear, sides, top, bottom. Claimed shape in solid lines, unclaimed context in broken lines, no reference numerals.
Mechanical patent drawings
Mechanical figures rely on section hatching for cut surfaces, consistent numerals across assembly states, and clean orthographic or perspective projection.
Electrical & circuit drawings
Circuit schematics use standard symbols and labeled nets; wiring diagrams use orthogonal routing. Both keep line weights uniform so the office can reproduce them at reduced scale.
Software flowcharts & process diagrams
Method claims are supported by flowcharts: numbered steps in boxes and decision diamonds, with arrows that make the claimed sequence unambiguous.
Block diagrams
System claims are supported by block diagrams: labeled rectangular modules, numbered 1xx/2xx/3xx by figure, connected by arrows that show signal or data flow.
Medical device drawings
Medical device figures often need multiple states (deployed/collapsed), cross-sections through housings, and exploded views — all with consistent numerals across figures.
Exploded views & cross-sections
Exploded views separate parts along a dashed alignment axis; cross-sections hatch every cut surface. Both must still satisfy line-weight and numeral rules.
The sample figures on this page were generated with PatentFig AI and are free to reuse in articles, tutorials, and course materials — credit PatentFig AI and link to patentfig.ai. Licensed under CC BY 4.0 The license permits reuse of the illustration asset; it does not mean an existing sample should be filed as a new patent drawing.
What does a patent drawing look like?
Every filing-ready patent figure — and every patent picture you see on this page — follows the same anatomy.
1
The sheet
White paper with fixed margins; figures are placed inside the usable area and numbered sheets assemble into the drawings section of the application.
2
Figure labels
Each view is a figure labeled FIG. 1, FIG. 2, … — one invention can span many figures across multiple sheets.
3
Reference numerals & leader lines
Numbered elements in the drawing (10, 12, 14 …) mark each claimed part, connected by thin leader lines, and keep the same number in every view.
4
Line-art rules
Solid black lines of uniform weight on white — no color, gray fills, or photo textures unless the office explicitly permits them.
Drawing vs. diagram vs. figure
Three words that overlap in search but mean different things in a patent application.
Patent drawing
The line-art view itself — a perspective, elevation, section, or exploded view of the invention drawn to convention.
Patent diagram
A schematic figure — block diagram, flowchart, circuit, or system diagram — used mostly in software, electrical, and AI/ML applications.
Patent figure
The formal unit the office sees: any drawing or diagram placed on a sheet and labeled FIG. n. Drawings and diagrams both become figures when filed.
How to use these examples
Examples are a faster starting point than a blank prompt.
Pick the closest category
Find the example that most resembles your invention type.
Open to pre-fill the generator
The prompt loads into /generate so you can adapt it to your invention.
Edit and add views
Adjust reference numerals, add views, and remove decorative shading.
Check before filing
Validate against your office with the figure checker, then export.
USPTO patent drawing requirements checklist (37 CFR 1.84)
Before filing a utility or design application, check these USPTO drawing conventions and sheet-preparation tips.
Black ink and uniform line weights
Use black-and-white line art on white paper with durable, dense, uniformly thick solid lines. Color drawings require a granted petition; photographs are accepted only where necessary to illustrate the invention.
Standard sheet size and margins
Every sheet in an application must be the same size — either A4 or 8.5 × 11 inch — with margins of at least 2.5 cm top, 2.5 cm left, 1.5 cm right, and 1.0 cm bottom. All lines, numerals, and labels stay inside the sight area.
Consecutive figure labels (FIG. 1, FIG. 2)
Figures are numbered consecutively in Arabic numerals preceded by "FIG.", independent of sheet numbers, and where possible in the order they appear on the drawing sheets. Multiple figures may share one sheet if they are clearly separated.
Reference numerals and leader lines
Mark each claimed utility part with an Arabic numeral at least 0.32 cm (1/8 inch) tall, placed outside the part and connected by a thin leader line that never crosses another leader. Use the identical numeral for the same part in every view.
Line shading, hatching, and broken lines
Indicate curved surfaces with spaced line or stipple shading rather than gray fills. Hatch cut material in cross-sections with parallel oblique lines, and use evenly spaced broken lines in design patents to show unclaimed environment.
Minimal text in figures
Keep text out of figures except for FIG. labels, short flowchart or block labels, and YES/NO decision branches. Scan or export sheets at 300 DPI or higher so thin lines stay legible.
Common patent drawing views and when to use each
A patent drawing set combines whichever views are needed so every claimed feature is visible without crowding a single figure.
Perspective view (isometric or three-quarter)
Shows the whole invention in three dimensions so the examiner sees how components relate in space before reading flat views. Commonly filed as FIG. 1 in mechanical utility applications and included in seven-view design sets.
Orthogonal views (front, rear, sides, top, bottom)
Flat elevations and plan views without perspective distortion. Utility filings include only the elevations needed to expose claimed features; design filings normally require all six orthogonal views drawn to consistent scale and projection.
Cross-sectional view (section and cutaway)
Slices through a housing or assembly along a cutting plane marked in a companion view. Material cut by the plane carries uniform parallel hatching, while internal chambers, fluid paths, and shafts lying in the plane remain unhatched.
Exploded view
Separates the parts of an assembly in order along a dashed alignment centerline. Used when overlapping housings or fasteners hide internal parts in an assembled view and each component needs its own reference numeral.
Enlarged detail and multi-state views
Detail callouts magnify small mechanisms — such as latches, threads, or stent struts — that would blur at full scale. Multi-state views show an assembly in two operating positions (open/closed, collapsed/expanded) side by side or with phantom lines.
Schematics, block diagrams, and flowcharts
Standard-symbol circuit schematics and orthogonal wiring diagrams support electrical claims; numbered rectangular block diagrams (1xx/2xx/3xx) with arrows support system claims; step-numbered flowcharts and sequence diagrams support method claims.
These examples help most when
- You want a reference for utility, design, mechanical, or electrical and circuit figures
- You are drafting a software flowchart, block diagram, or other process figure
- Your invention is a medical device or needs an exploded view or cross-section
- You want a working prompt to adapt instead of starting from a blank page
Look elsewhere when
- You need the exact office rules — see patent drawing requirements
- You need a six-office rule comparison — see patent drawing standards
- You want a finished figure now — open the generator and describe your invention
Patent drawing examples
Patent drawings & examples FAQ
Turn an example into your own figure
Open any example to pre-fill the generator, then adapt it to your invention and export.
Related tools and guides
Guide: what does a patent look like?
The anatomy of a US patent — title page, specification, claims, and drawing sheets.
Patent drawing generator
Generate a patent drawing from a text description.
Patent drawing software
The full PatentFig workspace for filing-ready figure sets.
Patent drawing requirements
What the USPTO requires for compliant drawings.
Figure checker
Validate figures against office rules before filing.
Patent figure numbering
How to number figures and reference numerals.
How to make patent drawings
Step-by-step workflow from sketch, photo, or CAD to filing-ready sheets.
Utility patent drawing generator
Generate utility figures with reference numerals.
Design patent drawing software
Consistent front/rear/side/top/bottom/perspective views.
Patent flowchart generator
Method and process flowcharts for software patents.
AI patent drawing generator
Photos, sketches, and 3D references to patent figures.
Patent diagram
Types, examples and USPTO rules for schematic figures.