B43L 9/00
Circular curve-drawing or like instruments
Official title: Circular curve-drawing or like instruments (curve rulers or templets B43L13/00)
B43L9/00 (Circular curve-drawing or like instruments) appears on 178 US grants and 78 published applications in this corpus.
Search patents in B43L- Granted patents
- 178
- Published applications
- 78
- Assignees
- 58
- Inventors
- 226
- Latest grant
- 19 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 4 | 0 |
| 1978 | 5 | 0 |
| 1979 | 9 | 0 |
| 1980 | 3 | 0 |
| 1981 | 3 | 0 |
| 1982 | 6 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 6 | 0 |
| 1986 | 3 | 0 |
| 1987 | 5 | 0 |
| 1988 | 5 | 0 |
| 1989 | 5 | 0 |
| 1990 | 4 | 0 |
| 1991 | 4 | 0 |
| 1992 | 6 | 0 |
| 1993 | 6 | 0 |
| 1994 | 2 | 0 |
| 1995 | 3 | 0 |
| 1996 | 5 | 0 |
| 1997 | 2 | 0 |
| 1998 | 6 | 0 |
| 1999 | 5 | 0 |
| 2000 | 0 | 0 |
| 2001 | 6 | 2 |
| 2002 | 4 | 4 |
| 2003 | 3 | 7 |
| 2004 | 2 | 2 |
| 2005 | 9 | 5 |
| 2006 | 5 | 4 |
| 2007 | 4 | 6 |
| 2008 | 5 | 4 |
| 2009 | 1 | 4 |
| 2010 | 3 | 7 |
| 2011 | 6 | 4 |
| 2012 | 3 | 2 |
| 2013 | 2 | 0 |
| 2014 | 3 | 2 |
| 2015 | 1 | 1 |
| 2016 | 3 | 3 |
| 2017 | 2 | 1 |
| 2018 | 2 | 2 |
| 2019 | 3 | 5 |
| 2020 | 2 | 1 |
| 2021 | 2 | 2 |
| 2022 | 0 | 1 |
| 2023 | 1 | 5 |
| 2024 | 3 | 2 |
| 2025 | 3 | 2 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
- B43L 9/02Compasses91
- B43L 9/16Features common to compasses, dividers, and callipers41
- B43L 9/007Circular curve-drawing or like instruments: with perforated or marked rulers36
- B43L 9/002Circular curve-drawing or like instruments: with perforated or marked discs13
- B43L 9/005Circular curve-drawing or like instruments: with rollers or carriages11
- B43L 9/08Proportional compasses or dividers9
- B43L 9/12Dividers2
- B43L 9/14Circular curve-drawing or like instruments: with changeable leg-ends for conversion into compasses1
Recent patents
- System and method for circle and curve drawing template19 Aug 2025US 12,391,061 B2
- Woodworking circle-drawing tool1 Jul 2025US 12,344,027 B2
- Electric pencil sharpener with delay function10 Jun 2025US 12,325,258 B2Dongguan In-Mind Technology Co., Ltd.
- Centerless drafting tool4 Jun 2024US 11,999,186 B2
- Equal divider9 Apr 2024US 11,951,766 B2
- Multifunctional geometry tool23 Oct 2025US 2025/0326246 A1
- Push-action compass7 Aug 2025US 2025/0249701 A1Guangzhou Wusheng Stationery Co.,Ltd
- Sticker, and an Insert for a Book18 Apr 2024US 2024/0123753 A1
- Equal divider14 Mar 2024US 2024/0083193 A1Sentou Industry Co., Ltd.
- Centerless compass17 Aug 2023US 2023/0256770 A1
Most cited
By later US patents