B23B 2251/40
Flutes, i.e. chip conveying grooves
B23B2251/40 (Flutes, i.e. chip conveying grooves) appears on 270 US grants and 264 published applications in this corpus.
Search patents in B23B- Granted patents
- 270
- Published applications
- 264
- Assignees
- 131
- Inventors
- 513
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 4 | 0 |
| 1986 | 6 | 0 |
| 1987 | 2 | 0 |
| 1988 | 4 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 3 | 0 |
| 1993 | 5 | 0 |
| 1994 | 4 | 0 |
| 1995 | 5 | 0 |
| 1996 | 2 | 0 |
| 1997 | 9 | 0 |
| 1998 | 10 | 0 |
| 1999 | 8 | 0 |
| 2000 | 6 | 0 |
| 2001 | 6 | 1 |
| 2002 | 3 | 3 |
| 2003 | 3 | 5 |
| 2004 | 0 | 5 |
| 2005 | 2 | 8 |
| 2006 | 3 | 8 |
| 2007 | 8 | 11 |
| 2008 | 4 | 4 |
| 2009 | 5 | 5 |
| 2010 | 4 | 6 |
| 2011 | 4 | 8 |
| 2012 | 4 | 9 |
| 2013 | 4 | 8 |
| 2014 | 4 | 13 |
| 2015 | 6 | 10 |
| 2016 | 15 | 16 |
| 2017 | 11 | 15 |
| 2018 | 15 | 18 |
| 2019 | 17 | 20 |
| 2020 | 10 | 23 |
| 2021 | 14 | 19 |
| 2022 | 16 | 10 |
| 2023 | 6 | 11 |
| 2024 | 6 | 14 |
| 2025 | 3 | 5 |
| 2026 | 11 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- B23B 2251/406Of special form not otherwise provided forIndexing code131
- B23B 2251/408Spiral groovesIndexing code111
- B23B 2251/404With decreasing depth in a direction towards the shank from the toolIndexing code21
- B23B 2251/402With increasing depth in a direction towards the shank from the toolIndexing code15
- B23B 2251/4011Two flutes merge into one fluteIndexing code1
- B23B 2251/4012Flutes with sleevesIndexing code1
Recent patents
- Micro-reinforced concentric twist drill1 Sep 2026US 12,722,213 B2Shandong Old Roughneck Machinery Technology Co. Ltd
- Drilling tool18 Aug 2026US 12,708,969 B2Robert Bosch GmbH
- Cutting tool4 Aug 2026US 12,697,666 B2Kennametal Inc.
- Drill and method for manufacturing machined product23 Jun 2026US 12,661,721 B2KYOCERA Corporation
- Annular hole cutter21 Apr 2026US 12,605,774 B2Hougen Manufacturing, Inc.
- Drill and method for manufacturing machined product1 Oct 2026US 2026/0295687 A1KYOCERA Corporation
- Drill30 Jul 2026US 2026/0216797 A1Mitsubishi Materials Corporation
- Efficient drilling tool with strong chip removal ability16 Jul 2026US 2026/0199989 A1Zhuzhou Cemented Carbide Cutting Tools Co., Ltd.
- Single-flute drill for printed wiring boards2 Jul 2026US 2026/0183849 A1Union Tool Co.
- Two-flute deep-hole drill for stainless steels and other high-alloy steel materials2 Jul 2026US 2026/0183850 A1botek Präzisionsbohrtechnik GmbH
Most cited
By later US patents
- Rotary end cutting tool85US 5,452,971 A1995
- Drill bit or end mill with grooved flutes73US 5,160,232 AMCA Micro Crystal AG · 1992
- Cutting insert with undulating concave chip forming groove57US 5,695,303 AIscar, Ltd. · 1997
- Plug cutter with radial relief56US 5,810,524 AWoodworker's Supply, Inc. · 1998
- Drill bit52US 5,947,659 A1999