Porous cap felt pen
US-12479232-B2 · Nov 25, 2025 · US
with ink reservoirs, e.g. funnel-shaped
with ink reservoirs, e.g. funnel-shaped · 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 | B43K1/01 |
| Official title | with ink reservoirs, e.g. funnel-shaped |
| Display label | with ink reservoirs, e.g. funnel-shaped |
| Total patents | 29 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 2 |
| 2017 | 1 |
| 2018 | 1 |
| 2019 | 2 |
| 2020 | 5 |
| 2021 | 4 |
| 2022 | 6 |
| 2023 | 2 |
| 2024 | 2 |
| 2025 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Dry erase inks, and associated methods and writing instruments
US-12338352-B2 · Jun 24, 2025 · US
Porous cap felt pen
US-2025033401-A1 · Jan 30, 2025 · US
Nib for writing felt pen
US-11926171-B2 · Mar 12, 2024 · US
Writing instrument comprising a switchable flow material
US-11884092-B2 · Jan 30, 2024 · US
Wicking nib device and system
US-11813887-B2 · Nov 14, 2023 · US
Wicking nib device and system
US-2023027704-A1 · Jan 26, 2023 · US
Nib for writing felt pen
US-2022388330-A1 · Dec 8, 2022 · US
Wicking nib device and system
US-11472219-B2 · Oct 18, 2022 · US
Writing felt pen
US-11364736-B2 · Jun 21, 2022 · US
Writing instrument comprising a switchable flow material
US-2022184994-A1 · Jun 16, 2022 · US
Ink-based marking device having a multi-component nib structure
US-11279165-B2 · Mar 22, 2022 · US
Dry Erase Inks, and Associated Methods and Writing Instruments
US-2022064464-A1 · Mar 3, 2022 · US
Wicking nib device and system
US-2021331513-A1 · Oct 28, 2021 · US
Writing instrument
US-11148460-B2 · Oct 19, 2021 · US
Pen tip and writing tool equipped with the pen tip
US-2021316566-A1 · Oct 14, 2021 · US
Liquid dispenser with discharge sponge
US-11109659-B2 · Sep 7, 2021 · US
Writing felt pen
US-2020398605-A1 · Dec 24, 2020 · US
Ink-based marking device having a multi-component nib structure
US-2020391538-A1 · Dec 17, 2020 · US
Electronic board
US-10817110-B2 · Oct 27, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B43K1/01?
- CPC B43K1/01 is the Cooperative Patent Classification code for “with ink reservoirs, e.g. funnel-shaped.”
- How many patents are filed under CPC B43K1/01 (with ink reservoirs, e.g. funnel-shaped)?
- Our database includes 29 publications tagged with this CPC code.
- Is patent activity under CPC B43K1/01 growing?
- Publication counts under this code: 2 in 2024 vs 3 in 2025 (latest complete years).