E21C 35/183
With inserts or layers of wear-resisting material
Official title: with inserts or layers of wear-resisting material {(drill bits with wear-resistant parts E21B10/46)}
E21C35/183 (With inserts or layers of wear-resisting material) appears on 382 US grants and 327 published applications in this corpus.
Search patents in E21C- Granted patents
- 382
- Published applications
- 327
- Assignees
- 102
- Inventors
- 425
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 4 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 9 | 0 |
| 1988 | 4 | 0 |
| 1989 | 8 | 0 |
| 1990 | 9 | 0 |
| 1991 | 2 | 0 |
| 1992 | 7 | 0 |
| 1993 | 4 | 0 |
| 1994 | 6 | 0 |
| 1995 | 2 | 0 |
| 1996 | 5 | 0 |
| 1997 | 7 | 0 |
| 1998 | 8 | 0 |
| 1999 | 2 | 0 |
| 2000 | 4 | 0 |
| 2001 | 7 | 0 |
| 2002 | 5 | 5 |
| 2003 | 5 | 8 |
| 2004 | 4 | 4 |
| 2005 | 3 | 2 |
| 2006 | 2 | 3 |
| 2007 | 1 | 7 |
| 2008 | 22 | 56 |
| 2009 | 8 | 17 |
| 2010 | 13 | 14 |
| 2011 | 23 | 13 |
| 2012 | 8 | 13 |
| 2013 | 12 | 21 |
| 2014 | 15 | 25 |
| 2015 | 17 | 25 |
| 2016 | 19 | 11 |
| 2017 | 9 | 17 |
| 2018 | 11 | 14 |
| 2019 | 23 | 18 |
| 2020 | 17 | 9 |
| 2021 | 19 | 16 |
| 2022 | 12 | 9 |
| 2023 | 9 | 9 |
| 2024 | 6 | 1 |
| 2025 | 5 | 4 |
| 2026 | 6 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Wear protection cap and a bit holder arrangement2 Jun 2026US 12,644,384 B2Sandvik Mining and Construction Oy
- Retention system for attaching tool bits to a blade assembly14 Apr 2026US 12,601,159 B2Caterpillar Inc.
- Rebuildable hard surface cutting tip for mining bit14 Apr 2026US 12,601,259 B2Bit Service Company LTD
- Cemented carbide insert with eta-phase core24 Feb 2026US 12,559,806 B2Sandvik Mining and Construction Tools AB
- Rotatable cutting tool with cutting insert and bolster24 Feb 2026US 12,560,085 B2Kennametal Inc.
- Pick tool13 Aug 2026US 2026/0235028 A1Element Six Limited
- Modular carbide tooling, hard and exotic materials combined with holders of different materials with options for wear and protection and machine tie30 Jul 2026US 2026/0218611 A1Kennametal Inc.
- Rebuildable hard surface cutting tip for mining bit25 Jun 2026US 2026/0176967 A1Bit Service Company LTD
- Cemented carbide insert with eta-phase core21 May 2026US 2026/0139338 A1Sandvik Mining and Construction Tools AB
- Tapered bushing for bit removal19 Feb 2026US 2026/0049459 A1Caterpillar Inc.
Most cited
By later US patents
- Tool comprised of a holder body and a hard insert and method of using same177US 5,417,475 ASandvik AB · 1995
- Tool for a mine working machine comprising a diamond-charged abrasive component165US 4,944,559 ASociete Industrielle de Combustible Nucleaire · 1990
- Pick for disintegrating natural and man-made materials158US 6,733,087 B22004
- Point attack bit156US 6,019,434 AFansteel Inc. · 2000
- Diamond coated cutting tool insert and method of making same152US 5,837,071 AMegadiamond, Inc. · 1998