Variable color shade marker
US-2024300258-A1 · Sep 12, 2024 · US
Ink reservoirs; Ink cartridges
Ink reservoirs; Ink cartridges · Cooperative Patent Classification (CPC)
Separating, mixing, shaping, printing, and transporting materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | B43K8/03 |
| Official title | Ink reservoirs; Ink cartridges |
| Display label | Ink reservoirs; Ink cartridges |
| Total patents | 74 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 9 |
| 2016 | 3 |
| 2017 | 3 |
| 2018 | 2 |
| 2019 | 6 |
| 2020 | 6 |
| 2021 | 10 |
| 2022 | 10 |
| 2023 | 9 |
| 2024 | 5 |
| 2025 | 11 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Writing instruments and associated methods
US-12064989-B2 · Aug 20, 2024 · US
Fiber-bundled part for writing instruments, and pen tip and writing instrument using the fiber-bundled part
US-2023406029-A1 · Dec 21, 2023 · US
Output Device for Uniformly Mixed Liquid and Method for Making and Using the Same
US-2023391130-A1 · Dec 7, 2023 · US
Liquid storage member for coating tools
US-11780258-B2 · Oct 10, 2023 · US
Writing instruments and associated nib assemblies
US-2023226844-A1 · Jul 20, 2023 · US
Ink reservoir unit for writing instruments and writing instruments
US-11679618-B2 · Jun 20, 2023 · US
Oil-based ink composition for writing instrument
US-11649363-B2 · May 16, 2023 · US
Nib for writing felt pen
US-11607902-B2 · Mar 21, 2023 · US
Cosmetic applicator
US-11589665-B2 · Feb 28, 2023 · US
Liquid storage and release device and pen
US-11548313-B2 · Jan 10, 2023 · US
Nib for writing felt pen
US-2022388330-A1 · Dec 8, 2022 · US
Liquid storage member for coating tools
US-2022355612-A1 · Nov 10, 2022 · US
Refill for a writing felt pen
US-11390108-B2 · Jul 19, 2022 · US
Writing instruments
US-2022203750-A1 · Jun 30, 2022 · US
Writing felt pen
US-11364736-B2 · Jun 21, 2022 · US
Ink reservoir unit for writing instruments and writing instruments
US-2022176728-A1 · Jun 9, 2022 · US
Applicator
US-11318777-B2 · May 3, 2022 · US
Dry Erase Inks, and Associated Methods and Writing Instruments
US-2022064464-A1 · Mar 3, 2022 · US
Cosmetic applicator
US-2022061496-A1 · Mar 3, 2022 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B43K8/03?
- CPC B43K8/03 is the Cooperative Patent Classification code for “Ink reservoirs; Ink cartridges.”
- How many patents are filed under CPC B43K8/03 (Ink reservoirs; Ink cartridges)?
- Our database includes 74 publications tagged with this CPC code.
- Is patent activity under CPC B43K8/03 growing?
- Publication counts under this code: 5 in 2024 vs 11 in 2025 (latest complete years).