B43K 21/20
With writing-cores automatically replaced from magazines
Official title: with writing-cores automatically replaced from magazines
B43K21/20 (With writing-cores automatically replaced from magazines) appears on 62 US grants and 3 published applications in this corpus.
Search patents in B43K- Granted patents
- 62
- Published applications
- 3
- Assignees
- 13
- Inventors
- 45
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 4 | 0 |
| 1981 | 4 | 0 |
| 1982 | 4 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 6 | 0 |
| 1987 | 4 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 3 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 4 | 0 |
| 1999 | 4 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 2 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 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 | 0 |
| 2019 | 0 | 2 |
| 2020 | 1 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Replaceable cartridge for a writing instrument and method thereof12 May 2026US 12,623,482 B2Societe BIC
- Mechanical pencil31 Mar 2020US 10,603,948 B2Kotobuki & Co., Ltd.
- Double-chuck mechanical pencil11 Feb 2003US 6,517,271 B1Kotobuki & Co., Ltd.
- Double-chuck mechanical pencil11 Feb 2003US 6,517,272 B1Kotobuki & Co., Ltd.
- Side knock type mechanical pencil3 Apr 2001US 6,210,058 B1Kotobuki & Co., Ltd.
Most cited
By later US patents
- Mechanical pencil with removable lead feed cover23US 4,500,220 APentel Kabushiki Kaisha · 1985
- Mechanical pencil with chuck closing by normal writing grip21US 4,270,870 AAncos Co., Ltd. · 1981
- Mechanical pencil with chuck closing by normal writing grip19US 4,358,210 AAncos Co., Ltd. · 1982
- Dispenser for selectively extending and retracting a substantially stick-shaped object and writing instrument19US 5,927,882 AKotobuki & Co., Ltd. · 1999
- Mechanical pencil16US 4,382,706 AAncos Co., Ltd. · 1983