E21B 33/167
Cementing plugs provided with anti-rotation mechanisms
Official title: {Cementing plugs provided with anti-rotation mechanisms, e.g. for easier drill-out}
E21B33/167 (Cementing plugs provided with anti-rotation mechanisms) appears on 86 US grants and 42 published applications in this corpus.
Search patents in E21B- Granted patents
- 86
- Published applications
- 42
- Assignees
- 37
- Inventors
- 112
- Latest grant
- 14 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 4 | 0 |
| 1994 | 3 | 0 |
| 1995 | 7 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 5 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 4 | 3 |
| 2003 | 1 | 0 |
| 2004 | 2 | 6 |
| 2005 | 4 | 1 |
| 2006 | 2 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 1 | 0 |
| 2014 | 1 | 4 |
| 2015 | 1 | 3 |
| 2016 | 2 | 3 |
| 2017 | 3 | 3 |
| 2018 | 1 | 3 |
| 2019 | 5 | 2 |
| 2020 | 6 | 3 |
| 2021 | 4 | 2 |
| 2022 | 4 | 1 |
| 2023 | 1 | 2 |
| 2024 | 1 | 1 |
| 2025 | 2 | 2 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Baffle collar with double tapered lock ring14 Apr 2026US 12,601,240 B1Expro North Sea Limited
- Hybrid dissolvable plugs for sealing downhole casing strings3 Feb 2026US 12,540,525 B2G&H Diversified Manufacturing LP
- Methods and devices for casing and cementing wellbores29 Apr 2025US 12,286,854 B1Thru Tubing Solutions, Inc.
- Wellbore plug and wellbore assembly with plug having a passive non-rotation mechanism25 Feb 2025US 12,234,703 B1Citadel Casing Solutions LLC
- Method and apparatus for dropping a pump down plug or ball8 Oct 2024US 12,110,755 B2Gulfstream Services, Inc.
- Hybrid dissolvable plugs for sealing downhole casing strings14 May 2026US 2026/0132696 A1G&H Diversified Manufacturing LP
- Completion component20 Nov 2025US 2025/0354455 A1Welltec Manufacturing Center Completions ApS
- Method and apparatus for dropping a pump down plug or ball13 Feb 2025US 2025/0052128 A1Gulfstream Services, Inc.
- Method and apparatus for dropping a pump down plug or ball29 Feb 2024US 2024/0068320 A1Gulfstream Services, Inc.
- Hybrid dissolvable plugs for sealing downhole casing strings3 Aug 2023US 2023/0243231 A1G&H Diversified Manufacturing LP
Most cited
By later US patents
- Frac plug with caged ball174US 6,491,116 B2Halliburton Energy Services.Inc. · 2002
- Frac plug with caged ball142US 6,394,180 B1Halliburton Energy Service,s Inc. · 2002
- Cementing apparatus118US 5,234,052 ADavis-Lynch, Inc. · 1993
- Well collar or shoe and cementing/drilling process102US 4,175,619 A1979
- Valve for wellbore use88US 5,836,395 AWeatherford/Lamb, Inc. · 1998