B43K 21/04
With the writing-cores brought into position by gravity
Official title: with the writing-cores brought into position by gravity
B43K21/04 (With the writing-cores brought into position by gravity) appears on 10 US grants and 4 published applications in this corpus.
Search patents in B43K- Granted patents
- 10
- Published applications
- 4
- Assignees
- 6
- Inventors
- 13
- Latest grant
- 13 Mar 2018
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 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 | 1 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
| 2017 | 0 | 0 |
| 2018 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Writing utensil with retract piece13 Mar 2018US 9,914,322 B2Zebra Co., Ltd.
- Writing instrument26 Jan 2010US 7,651,289 B2
- Double chuck type mechanical pencil and internal writing mechanism thereof7 May 2002US 6,382,859 B1Kotobuki & Co., Ltd.
- Mechanical pencil with tapered supply chamber23 Jul 1991US 5,033,894 AMitsubishi Pencil Company, Limited
- Lead cartridge with an openable capping structure12 Mar 1991US 4,998,837 AKotobuki & Co., Ltd.
- Writing utensil with retract piece29 Dec 2016US 2016/0375715 A1Zebra Co., Ltd.
- Mechanical pencil with rotating cylinder7 Aug 2008US 2008/0187388 A1
- Writing instrument4 Oct 2007US 2007/0231049 A1
- Double chuck type mechanical pencil and internal writing mechanism thereof26 Jul 2001US 2001/0009628 A1Kotobuki & Co., Ltd.
Most cited
By later US patents
- Mechanical pencil12US 3,945,733 AA. W. Faber-Castell · 1976
- Mechanical pencil with automatic and manual lead advance8US 4,149,813 AA. W. Faber-Castell · 1979
- Lead cartridge with an openable capping structure8US 4,998,837 AKotobuki & Co., Ltd. · 1991
- Mechanical pencil4US 3,998,558 AA. W. Faber-Castell · 1976
- Double chuck type mechanical pencil and internal writing mechanism thereof3US 6,382,859 B1Kotobuki & Co., Ltd. · 2002