E21B 10/44
Bits with helical conveying portion
Official title: Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts (E21B10/42 takes precedence)
E21B10/44 (Bits with helical conveying portion) appears on 389 US grants and 210 published applications in this corpus.
Search patents in E21B- Granted patents
- 389
- Published applications
- 210
- Assignees
- 172
- Inventors
- 609
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 9 | 0 |
| 1978 | 7 | 0 |
| 1979 | 3 | 0 |
| 1980 | 5 | 0 |
| 1981 | 11 | 0 |
| 1982 | 5 | 0 |
| 1983 | 6 | 0 |
| 1984 | 6 | 0 |
| 1985 | 5 | 0 |
| 1986 | 4 | 0 |
| 1987 | 2 | 0 |
| 1988 | 4 | 0 |
| 1989 | 5 | 0 |
| 1990 | 15 | 0 |
| 1991 | 7 | 0 |
| 1992 | 8 | 0 |
| 1993 | 7 | 0 |
| 1994 | 8 | 0 |
| 1995 | 12 | 0 |
| 1996 | 9 | 0 |
| 1997 | 9 | 0 |
| 1998 | 11 | 0 |
| 1999 | 9 | 0 |
| 2000 | 12 | 0 |
| 2001 | 12 | 6 |
| 2002 | 7 | 7 |
| 2003 | 5 | 8 |
| 2004 | 5 | 6 |
| 2005 | 6 | 4 |
| 2006 | 4 | 7 |
| 2007 | 3 | 5 |
| 2008 | 3 | 8 |
| 2009 | 8 | 4 |
| 2010 | 8 | 3 |
| 2011 | 4 | 5 |
| 2012 | 3 | 4 |
| 2013 | 2 | 9 |
| 2014 | 1 | 8 |
| 2015 | 10 | 5 |
| 2016 | 10 | 15 |
| 2017 | 9 | 9 |
| 2018 | 8 | 15 |
| 2019 | 16 | 13 |
| 2020 | 12 | 12 |
| 2021 | 16 | 8 |
| 2022 | 8 | 16 |
| 2023 | 13 | 14 |
| 2024 | 15 | 7 |
| 2025 | 9 | 6 |
| 2026 | 4 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Handheld augers operable in a normal mode and a breaker mode14 Jul 2026US 12,680,388 B2Milwaukee Electric Tool Corporation
- Hurricane protection system for personal belongings2 Jun 2026US 12,644,303 B1
- Rotating check valve for improved downhole operations3 Mar 2026US 12,565,812 B2Schlumberger Technology Corporation
- Flow rate pressure control during mill-out operations24 Feb 2026US 12,560,035 B2Schlumberger Technology Corporation
- Hollow shaft drill bit and hollow insert with perforations or solid feeder auger(s) and perforated hollow shaft or solid flexible screw feeder auger(s)18 Nov 2025US 12,471,510 B2Sub-Mergent Technologies, Inc.
- Augers8 Oct 2026US 2026/0308981 A1Milwaukee Electric Tool Corporation
- Masonry drill having five blades2 Jul 2026US 2026/0183848 A1Hilti Aktiengesellschaft
- Rotating check valve for improved downhole operations2 Jul 2026US 2026/0185408 A1Schlumberger Technology Corporation
- Downhole casing auger for removal of paraffin from oil and gas wells12 Mar 2026US 2026/0071501 A1Missaukee Oil and Gas Company LLC
- Hand-held power tool26 Feb 2026US 2026/0055669 A1Black & Decker Inc.
Most cited
By later US patents
- Rotary drill bit with improved cutter and seal protection130US 5,452,771 ADresser Industries, Inc. · 1995
- Rotary drill bit with improved cutter and seal protection122US 5,518,077 ADresser Industries, Inc. · 1996
- Sintered diamond drill bits and method of making106US 5,443,337 A1995
- Rotatable bit having a resilient retainer sleeve with clearance98US 6,851,758 B2Kennametal Inc. · 2005
- Crane-mounted drill and method for in-situ treatment of contaminated soil97US 5,135,058 AMillgard Environmental Corporation · 1992