E21B 7/001
Drilling a non circular hole
Official title: {Drilling a non circular hole (excavating trenches E02F5/02; cutting machines for slitting E21C25/00)}
E21B7/001 (Drilling a non circular hole) appears on 40 US grants and 17 published applications in this corpus.
Search patents in E21B- Granted patents
- 40
- Published applications
- 17
- Assignees
- 29
- Inventors
- 81
- Latest grant
- 14 May 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 3 | 0 |
| 1978 | 4 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 0 | 0 |
| 1998 | 3 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 2 |
| 2009 | 0 | 1 |
| 2010 | 0 | 1 |
| 2011 | 0 | 3 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 0 | 0 |
| 2015 | 1 | 1 |
| 2016 | 1 | 1 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 2 |
| 2020 | 0 | 0 |
| 2021 | 1 | 0 |
| 2022 | 1 | 3 |
| 2023 | 2 | 1 |
| 2024 | 2 | 0 |
| 2025 | 0 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Diaphragm wall down-the-hole hammer trenching machine and use method thereof14 May 2024US 11,982,157 B2
- Square pile construction method and equipment of a rotary drilling rig6 Feb 2024US 11,891,892 B2Chengdu Xinhao Foundation Engineering Co., Ltd.
- In-situ square sample acquisition device and method for bond contact test of surrounding rock and a shotcrete layer16 May 2023US 11,648,707 B2Changjiang River Scientific Research Institute of Changjiang Water Resources Commission
- Method of deploying a heat exchanger pipe2 May 2023US 11,639,814 B2
- Method of deploying a heat exchanger pipe15 Mar 2022US 11,274,856 B2
- Wells having non-circular cross-sections and methods of use thereof9 Jul 2026US 2026/0193938 A1The Board of Regents of the University of Oklahoma
- Diaphragm wall down-the-hole hammer trenching machine and use method thereof12 Oct 2023US 2023/0323735 A1
- Square pile construction method and equipment of a rotary drilling rig21 Jul 2022US 2022/0228440 A1Chengdu Xinhao Foundation Engineering Co., Ltd.
- Method of deploying a heat exchanger pipe9 Jun 2022US 2022/0178589 A1
- In-situ square sample acquisition device and method for bond contact test of surrounding rock and a shotcrete layer2 Jun 2022US 2022/0170825 A1Changjiang River Scientific Research Institute, Changjiang Water Resources Commision
Most cited
By later US patents
- Process and apparatus for producing deep boreholes24US 4,116,285 ACoyne & Bellier, Bureau d' ingenieurs Conseils · 1978
- Slotted wall milling cutter20US 4,694,915 AKarl Bauer Spezialtiefbau GmbH & Co. KG · 1987
- Pipe-laying apparatus20US 5,174,686 A1992
- Bore hole mining19US 4,330,155 ASanta Fe International Corporation · 1982
- Square hole drill17US 4,074,778 AThe United States of America as represented by the Secretary of the Interior · 1978