C09D 13/00
Pencil-leads
Official title: Pencil-leads; Crayon compositions; Chalk compositions
C09D13/00 (Pencil-leads) appears on 184 US grants and 130 published applications in this corpus.
Search patents in C09D- Granted patents
- 184
- Published applications
- 130
- Assignees
- 88
- Inventors
- 270
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 5 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 4 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 4 | 0 |
| 1992 | 4 | 0 |
| 1993 | 5 | 0 |
| 1994 | 9 | 0 |
| 1995 | 9 | 0 |
| 1996 | 6 | 0 |
| 1997 | 5 | 0 |
| 1998 | 8 | 0 |
| 1999 | 1 | 0 |
| 2000 | 9 | 0 |
| 2001 | 9 | 3 |
| 2002 | 3 | 3 |
| 2003 | 5 | 5 |
| 2004 | 7 | 4 |
| 2005 | 1 | 4 |
| 2006 | 1 | 5 |
| 2007 | 4 | 4 |
| 2008 | 1 | 3 |
| 2009 | 1 | 5 |
| 2010 | 3 | 3 |
| 2011 | 2 | 6 |
| 2012 | 2 | 3 |
| 2013 | 3 | 5 |
| 2014 | 4 | 2 |
| 2015 | 2 | 3 |
| 2016 | 1 | 9 |
| 2017 | 5 | 8 |
| 2018 | 8 | 7 |
| 2019 | 7 | 9 |
| 2020 | 5 | 4 |
| 2021 | 5 | 8 |
| 2022 | 2 | 2 |
| 2023 | 2 | 6 |
| 2024 | 6 | 4 |
| 2025 | 2 | 7 |
| 2026 | 1 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Coloring pencil lead for synthetic pencil based on biopolymers blends28 Jul 2026US 12,691,703 B2Societe BIC
- Superhydrophobic anti-fouling crayon having capsaicin, medetomidine and other macrofouling inhibitors that is transparent to electronic sensors25 Nov 2025US 12,480,004 B1Barnacle-Blocker, LLC
- Active stylus having physical writing function11 Feb 2025US 12,223,127 B2Dexin Corporation
- Graphite lead or graphite chalk or graphite block, pencil with graphite lead, and method for producing a graphite lead or graphite chalk or graphite block26 Nov 2024US 12,152,158 B2Faber-Castell AG
- Color-change and erasable writing compositions, writing instruments, and systems22 Oct 2024US 12,122,930 B2Crayola LLC
- Pencil lead with polyhydroxybutyric acid binder and pencil with the lead1 Oct 2026US 2026/0296088 A1Staedtler SE
- Non-baked pencil lead30 Jul 2026US 2026/0217998 A1Mitsubishi Pencil Company, Limited
- Wax crayon comprising calcium silicate16 Jul 2026US 2026/0201193 A1Societe BIC
- Core for writing, drawing and/or painting implements and methods for the production thereof9 Jul 2026US 2026/0192591 A1Staedtler SE
- Wax crayon comprising multiple pigments9 Jul 2026US 2026/0193484 A1Societe BIC
Most cited
By later US patents
- Phosphorescent and fluorescent marking composition89US 5,498,280 ABinney & Smith Inc. · 1996
- Marking composition and method for marking dark substrates62US 6,210,471 B1Binney & Smith Inc. · 2001
- Low-moisture, frangible aerated confections and method of preparation49US 4,251,561 AGeneral Mills, Inc. · 1981
- Color-changing marking composition system44US 5,464,470 ABinney & Smith Inc. · 1995
- Golf practice aid43US 5,120,358 A1992