B23B 2251/287
Cutting edges having different lengths
B23B2251/287 (Cutting edges having different lengths) appears on 15 US grants and 13 published applications in this corpus.
Search patents in B23B- Granted patents
- 15
- Published applications
- 13
- Assignees
- 15
- Inventors
- 33
- Latest grant
- 25 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 3 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 2 |
| 2002 | 2 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 2 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 1 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 1 | 0 |
| 2015 | 1 | 1 |
| 2016 | 2 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 1 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 1 |
| 2024 | 1 | 1 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Twist drill bit having a cutting tip with a stepped structure25 Nov 2025US 12,479,036 B2Guehring KG
- Carbide tip hole saw21 May 2024US 11,986,890 B2The M. K. Morse Company
- Drill bit for drilling laminates22 Jan 2019US 10,183,343 B2Walter AG
- Micro-drill and method for manufacturing the micro-drill18 Oct 2016US 9,468,981 B2Shenzhen Jinzhou Precision Technology Corp.
- Drilling tool and method for drilling2 Feb 2016US 9,248,511 B2Kennametal Inc.
- Drill Blade for Drilling Hard Materials and Drill Bit12 Sep 2024US 2024/0300033 A1Robert Bosch GmbH
- Carbide tip hole saw10 Aug 2023US 2023/0249266 A1The M. K. Morse Company
- Twist drill bit having a cutting tip with a stepped structure27 Oct 2022US 2022/0339714 A1Guehring KG
- Drill bit for drilling laminates8 Mar 2018US 2018/0065190 A1Walter AG
- Micro-drill and method for manufacturing the micro-drill2 Jul 2015US 2015/0183031 A1Shenzhen Jinzhou Precision Technology Corp.
Most cited
By later US patents
- Rotary drill bit for hand-held power drills52US 4,189,266 A1980
- Drill comprised of hard metal for drilling contact holes in circuit boards and the like24US 4,231,692 ASiemens Aktiengesellschaft · 1980
- Method of producing holes free of accretions in circuit boards made of plastic19US 4,190,386 ASiemens Aktiengesellschaft · 1980
- Metal cutting drill with insert having radially overlapping cutting edges18US 6,019,553 ASandvik AB · 2000
- Drill bit of the twist drill type12US 5,380,133 AEmhart Inc. · 1995