B23B 2251/46
Drills having a centre free from cutting edges or with recessed cutting
Official title: Drills having a centre free from cutting edges or with recessed cutting edges
B23B2251/46 (Drills having a centre free from cutting edges or with recessed cutting) appears on 26 US grants and 22 published applications in this corpus.
Search patents in B23B- Granted patents
- 26
- Published applications
- 22
- Assignees
- 23
- Inventors
- 50
- Latest grant
- 5 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 1 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 1 |
| 2005 | 0 | 1 |
| 2006 | 1 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 1 | 3 |
| 2012 | 1 | 1 |
| 2013 | 0 | 1 |
| 2014 | 1 | 1 |
| 2015 | 2 | 4 |
| 2016 | 1 | 1 |
| 2017 | 3 | 1 |
| 2018 | 1 | 0 |
| 2019 | 1 | 1 |
| 2020 | 0 | 1 |
| 2021 | 1 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
| 2025 | 0 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Anti-skive drill bit5 May 2026US 12,617,030 B2Stryker European Operations Limited
- Tool holder for lathe and lathe provided with the tool holder21 Sep 2021US 11,123,804 B2Dmg Mori Co., Ltd.
- Cutting tip22 Jan 2019US 10,183,342 B2Diager
- Tubular parts and embeddable electrical boxes22 May 2018US 9,979,171 B2
- Drill bit with an exchangeable cutting portion21 Nov 2017US 9,821,379 B2Hilti Aktiengesellschaft
- Drill bit tip and drill with drill bit tip, mold and method for manufacturing drill bit tip17 Apr 2025US 2025/0121441 A1Drill Holding ApS
- Anti-Skive Drill Bit1 Feb 2024US 2024/0033833 A1Stryker European Operations Limited
- Device for detaching at least one burr from an opening of at least one transverse bore-hole of a workpiece, drilling station having the device and method for detaching the at least one burr using the drilling station6 Aug 2020US 2020/0246882 A1Schaeffler Technologies AG & Co. KG
- Tool Holder for Lathe and Lathe Provided with the Tool Holder25 Apr 2019US 2019/0118268 A1Dmg Mori Co., Ltd.
- Tubular part, embeddable electrical box, and kits formed by both23 Feb 2017US 2017/0054281 A1
Most cited
By later US patents
- Composite sintered twist drill52US 4,762,445 APrecorp, Inc. · 1988
- Drill with replaceable cutting inserts35US 5,092,718 AMetal Cutting Tools, Inc. · 1992
- Multigroove drill bit with angled frontal ridges34US 4,594,034 AHartmetallwerkzeugfabrik Andreas Maier GmbH & Co. KG · 1986
- Carbide tipped drill bit for boring holes in concrete and steel29US 4,143,723 A1979
- Drill bit28US 4,565,471 AMitsubishi Kinzoku Kabushiki Kaisha · 1986