B43K 21/033
With automatic feed by pressure during use of pencil
Official title: with automatic feed by pressure during use of pencil
B43K21/033 (With automatic feed by pressure during use of pencil) appears on 24 US grants and 11 published applications in this corpus.
Search patents in B43K- Granted patents
- 24
- Published applications
- 11
- Assignees
- 10
- Inventors
- 31
- Latest grant
- 4 Feb 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 4 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 1 | 0 |
| 2006 | 1 | 1 |
| 2007 | 2 | 1 |
| 2008 | 1 | 1 |
| 2009 | 1 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 1 |
| 2020 | 1 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 2 |
| 2023 | 0 | 0 |
| 2024 | 1 | 1 |
| 2025 | 1 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Mechanical pencil4 Feb 2025US 12,214,616 B2Mitsubishi Pencil Company, Limited
- Mechanical pencil30 Jan 2024US 11,884,093 B2Mitsubishi Pencil Company, Limited
- Stylus21 Jan 2020US 10,540,024 B2Wacom Co., Ltd.
- Writing stylus28 Jul 2009US 7,567,242 B2LeapFrog Enterprises, Inc.
- Mechanical pencil11 Nov 2008US 7,448,815 B1
- Mechanical pencil5 Feb 2026US 2026/0034828 A1Mitsubishi Pencil Company, Limited
- Mechanical pencil21 Nov 2024US 2024/0383270 A1Mitsubishi Pencil Company, Limited
- Mechanical pencil16 Jun 2022US 2022/0184995 A1Mitsubishi Pencil Company, Limited
- Mechanical pencil12 May 2022US 2022/0144008 A1Mitsubishi Pencil Company, Limited
- Mechanical pencil10 Oct 2019US 2019/0308442 A1Kotobuki & Co., Ltd.
Most cited
By later US patents
- Writing stylus33US 7,567,242 B2LeapFrog Enterprises, Inc. · 2009
- Mechanical pencil with removable lead feed cover23US 4,500,220 APentel Kabushiki Kaisha · 1985
- Mechanical pencil12US 4,714,365 AKotobuki & Co., Ltd. · 1987
- Writing implement with automatic lead projection11US 4,478,529 AKabushiki Kaisha Sakurakurepasu · 1984
- Automatic pencil9US 4,171,170 AKotobuki & Co., Ltd. · 1979