B23B 2251/443
Double margin drills
B23B2251/443 (Double margin drills) appears on 27 US grants and 34 published applications in this corpus.
Search patents in B23B- Granted patents
- 27
- Published applications
- 34
- Assignees
- 23
- Inventors
- 74
- Latest grant
- 30 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 2 |
| 2007 | 2 | 0 |
| 2008 | 1 | 1 |
| 2009 | 0 | 3 |
| 2010 | 0 | 0 |
| 2011 | 1 | 3 |
| 2012 | 1 | 0 |
| 2013 | 1 | 1 |
| 2014 | 2 | 1 |
| 2015 | 0 | 1 |
| 2016 | 1 | 0 |
| 2017 | 0 | 2 |
| 2018 | 2 | 3 |
| 2019 | 3 | 1 |
| 2020 | 0 | 4 |
| 2021 | 2 | 1 |
| 2022 | 3 | 2 |
| 2023 | 0 | 3 |
| 2024 | 1 | 2 |
| 2025 | 3 | 1 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Drill30 Dec 2025US 12,508,661 B2Sumitomo Electric Hardmetal Corp.
- Drill for carbon-fiber composite material29 Apr 2025US 12,285,810 B2Bic Tool Co., Ltd.
- Drill18 Mar 2025US 12,251,765 B2Sumitomo Electric Hardmetal Corp.
- Drilling tool3 Sep 2024US 12,076,796 B2Ceratizit Balzheim GmbH & Co. KG
- Small-diameter drill bit16 Aug 2022US 11,413,690 B2MOLDINO Tool Engineering, Ltd.
- Two-flute deep-hole drill for stainless steels and other high-alloy steel materials2 Jul 2026US 2026/0183850 A1botek Präzisionsbohrtechnik GmbH
- Drill and method of manufacturing machined product25 Jun 2026US 2026/0175301 A1KYOCERA Corporation
- Drill and method of manufacturing machined product3 Jul 2025US 2025/0214155 A1KYOCERA Corporation
- Drill and method of producing drilled product1 Aug 2024US 2024/0253132 A1Subaru Corporation
- Drill4 Jul 2024US 2024/0217007 A1Bic Tool Co., Ltd.
Most cited
By later US patents
- Drill bit or end mill with grooved flutes73US 5,160,232 AMCA Micro Crystal AG · 1992
- One-piece rotary material removing tool of sintered hard metal31US 4,826,364 AStellram S.A. · 1989
- Drill with groove width variation along the drill and double margin with a thinning section at the tip28US 7,306,411 B2Mitsubishi Materials Corporation · 2007
- Drill having construction suitable for enlarging previously formed hole14US 7,422,396 B2Osg Corporation · 2008
- Drilling tool9US 6,032,749 AHilti Aktiengesellschaft · 2000