B23B 2251/44
Margins, i.e. the narrow portion of the land which is not cut
Official title: Margins, i.e. the narrow portion of the land which is not cut away to provide clearance on the circumferential surface
B23B2251/44 (Margins, i.e. the narrow portion of the land which is not cut) appears on 78 US grants and 100 published applications in this corpus.
Search patents in B23B- Granted patents
- 78
- Published applications
- 100
- Assignees
- 60
- Inventors
- 191
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 3 |
| 2004 | 0 | 2 |
| 2005 | 1 | 3 |
| 2006 | 3 | 3 |
| 2007 | 2 | 3 |
| 2008 | 2 | 4 |
| 2009 | 2 | 5 |
| 2010 | 2 | 2 |
| 2011 | 2 | 4 |
| 2012 | 3 | 4 |
| 2013 | 1 | 4 |
| 2014 | 4 | 5 |
| 2015 | 4 | 5 |
| 2016 | 3 | 1 |
| 2017 | 5 | 6 |
| 2018 | 8 | 8 |
| 2019 | 5 | 5 |
| 2020 | 1 | 7 |
| 2021 | 5 | 4 |
| 2022 | 6 | 5 |
| 2023 | 2 | 7 |
| 2024 | 4 | 5 |
| 2025 | 3 | 2 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Micro-reinforced concentric twist drill1 Sep 2026US 12,722,213 B2Shandong Old Roughneck Machinery Technology Co. Ltd
- 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
- 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
- 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
- Method for producing a drill tool cutting section and such a drill tool cutting section6 Feb 2025US 2025/0041951 A1AB Sandvik Coromant
Most cited
By later US patents
- Drill bit point115US 5,273,380 A1993
- Drill bit or end mill with grooved flutes73US 5,160,232 AMCA Micro Crystal AG · 1992
- Twist drill35US 5,350,261 AMitsubishi Materials Corporation · 1994
- One-piece rotary material removing tool of sintered hard metal31US 4,826,364 AStellram S.A. · 1989
- Drilling tools for machine tool and method of producing the same31US 6,030,155 AKomet Praezisonswerkzeuge Robert Breuning GmbH · 2000