Pencil lead and manufacturing method for same
US-2025340082-A1 · Nov 6, 2025 · US
Pencil-leads; Crayon compositions; Chalk compositions
Pencil-leads; Crayon compositions; Chalk compositions · Cooperative Patent Classification (CPC)
Chemical and metallurgical processes, compounds, and materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | C09D13/00 |
| Official title | Pencil-leads; Crayon compositions; Chalk compositions |
| Display label | Pencil-leads; Crayon compositions; Chalk compositions |
| Total patents | 53 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 2 |
| 2017 | 4 |
| 2018 | 6 |
| 2019 | 6 |
| 2020 | 5 |
| 2021 | 9 |
| 2023 | 6 |
| 2024 | 9 |
| 2025 | 5 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Non-baked pencil lead
US-2025320369-A1 · Oct 16, 2025 · US
Water-based solid marking composition
US-2025263573-A1 · Aug 21, 2025 · US
Active stylus having physical writing function
US-12223127-B2 · Feb 11, 2025 · US
Wax crayon comprising zro2
US-2025034422-A1 · Jan 30, 2025 · US
Oligoester and cosmetic containing said oligoester
US-2024407998-A1 · Dec 12, 2024 · US
Lead comprising binder made from cellulose esters
US-2024400850-A1 · Dec 5, 2024 · US
Color-change and erasable writing compositions, writing instruments, and systems
US-12122930-B2 · Oct 22, 2024 · US
Erasable writing compositions
US-12097722-B2 · Sep 24, 2024 · US
Non-baked pencil lead and method for manufacturing non-baked pencil lead
US-2024209230-A1 · Jun 27, 2024 · US
Color-change and erasable writing compositions, writing instruments, and systems
US-2024101853-A1 · Mar 28, 2024 · US
Active stylus having physical writing function
US-2024094834-A1 · Mar 21, 2024 · US
Preparation of silica-coated calcium carbonates with increased surface area and mesoporosity
US-11872294-B2 · Jan 16, 2024 · US
Color-change and erasable writing compositions, writing instruments, and systems
US-11866603-B2 · Jan 9, 2024 · US
Pencil lead
US-2023398808-A1 · Dec 14, 2023 · US
Improved coloring pencil lead for synthetic pencil based on biopolymers blends
US-2023373236-A1 · Nov 23, 2023 · US
Curable polyfarnesene-based compositions
US-2023265235-A1 · Aug 24, 2023 · US
Body for a writing, tracing, drawing or coloring pencil
US-11718124-B2 · Aug 8, 2023 · US
Calcined solid drawing material
US-2023242784-A1 · Aug 3, 2023 · US
Curable polyfarnesene-based compositions
US-11634531-B2 · Apr 25, 2023 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C09D13/00?
- CPC C09D13/00 is the Cooperative Patent Classification code for “Pencil-leads; Crayon compositions; Chalk compositions.”
- How many patents are filed under CPC C09D13/00 (Pencil-leads; Crayon compositions; Chalk compositions)?
- Our database includes 53 publications tagged with this CPC code.
- Is patent activity under CPC C09D13/00 growing?
- Publication counts under this code: 9 in 2024 vs 5 in 2025 (latest complete years).