B43K 21/22
Writing-cores gripping means
Official title: Writing-cores gripping means, e.g. chucks
B43K21/22 (Writing-cores gripping means) appears on 113 US grants and 87 published applications in this corpus.
Search patents in B43K- Granted patents
- 113
- Published applications
- 87
- Assignees
- 44
- Inventors
- 146
- Latest grant
- 4 Feb 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 4 | 0 |
| 1990 | 4 | 0 |
| 1991 | 4 | 0 |
| 1992 | 4 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 2 |
| 2002 | 2 | 2 |
| 2003 | 1 | 2 |
| 2004 | 3 | 4 |
| 2005 | 4 | 1 |
| 2006 | 3 | 3 |
| 2007 | 5 | 11 |
| 2008 | 4 | 3 |
| 2009 | 2 | 2 |
| 2010 | 8 | 8 |
| 2011 | 2 | 4 |
| 2012 | 2 | 3 |
| 2013 | 4 | 1 |
| 2014 | 2 | 2 |
| 2015 | 1 | 7 |
| 2016 | 3 | 2 |
| 2017 | 6 | 0 |
| 2018 | 0 | 5 |
| 2019 | 5 | 8 |
| 2020 | 5 | 6 |
| 2021 | 3 | 3 |
| 2022 | 2 | 5 |
| 2023 | 2 | 0 |
| 2024 | 3 | 2 |
| 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 pencil26 Nov 2024US 12,151,503 B2Wenzhou Tianjiao Pen Industrial Co., Ltd.
- Mechanical pencil28 May 2024US 11,993,097 B2Kabushiki Kaisha Pilot Corporation
- Mechanical pencil30 Jan 2024US 11,884,093 B2Mitsubishi Pencil Company, Limited
- Inductor core, electronic pen, and input device24 Oct 2023US 11,794,511 B2KYOCERA Corporation
- Mechanical pencil5 Feb 2026US 2026/0034828 A1Mitsubishi Pencil Company, Limited
- Mechanical pencil21 Nov 2024US 2024/0383270 A1Mitsubishi Pencil Company, Limited
- Mechanical pencil28 Mar 2024US 2024/0100877 A1Wenzhou Tianjiao Pen Industrial Co., Ltd.
- Mechanical pencil29 Dec 2022US 2022/0410614 A1KABUSHIKI KAISHA PILOT CORPORATION (also trading as PILOT CORPORATION)
- Mechanical pencil having lead breakage-prevention mechanism17 Nov 2022US 2022/0363086 A1Micro Co., Ltd.
Most cited
By later US patents
- Writing stylus33US 7,567,242 B2LeapFrog Enterprises, Inc. · 2009
- Mechanical pencil21US 5,044,805 A1991
- Double-chuck mechanical pencil17US 6,334,728 B12002
- Working out container of bar shaped article14US 4,856,693 AKotobuki & Co., Ltd. · 1989
- Automatic sharp pencil13US 4,386,865 AKotobuki & Co., Ltd. · 1983