B43K 21/027
With sliding tubelike writing-core guide
Official title: with sliding tubelike writing-core guide
B43K21/027 (With sliding tubelike writing-core guide) appears on 76 US grants and 35 published applications in this corpus.
Search patents in B43K- Granted patents
- 76
- Published applications
- 35
- Assignees
- 29
- Inventors
- 92
- Latest grant
- 4 Feb 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 4 | 0 |
| 1985 | 5 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 5 | 0 |
| 1990 | 5 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 1 |
| 2002 | 0 | 2 |
| 2003 | 0 | 0 |
| 2004 | 1 | 1 |
| 2005 | 2 | 0 |
| 2006 | 1 | 2 |
| 2007 | 3 | 5 |
| 2008 | 2 | 1 |
| 2009 | 2 | 1 |
| 2010 | 5 | 4 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 3 |
| 2015 | 1 | 1 |
| 2016 | 3 | 1 |
| 2017 | 1 | 0 |
| 2018 | 0 | 4 |
| 2019 | 3 | 3 |
| 2020 | 4 | 1 |
| 2021 | 0 | 0 |
| 2022 | 0 | 3 |
| 2023 | 1 | 0 |
| 2024 | 1 | 1 |
| 2025 | 1 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Mechanical pencil4 Feb 2025US 12,214,616 B2Mitsubishi Pencil Company, Limited
- Mechanical pencil30 Jan 2024US 11,884,093 B2Mitsubishi Pencil Company, Limited
- Mechanical pencil having lead breakage-prevention mechanism16 May 2023US 11,648,796 B2Micro Co., Ltd.
- Writing instrument side-knock mechanism24 Nov 2020US 10,843,502 B2Sanford, L. P.
- Mechanical pencil with a side button and an eraser dispenser and a method of assembly2 Jun 2020US 10,668,766 B2Societe BIC
- Mechanical pencil5 Feb 2026US 2026/0034828 A1Mitsubishi Pencil Company, Limited
- Mechanical pencil21 Nov 2024US 2024/0383270 A1Mitsubishi Pencil Company, Limited
- Mechanical pencil having lead breakage-prevention mechanism17 Nov 2022US 2022/0363086 A1Micro Co., Ltd.
- Mechanical pencil16 Jun 2022US 2022/0184995 A1Mitsubishi Pencil Company, Limited
- Mechanical pencil12 May 2022US 2022/0144008 A1Mitsubishi Pencil Company, Limited
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 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
- Mechanical pencil with a fluid actuator19US 4,911,569 AAncos Co., Ltd. · 1990