E21B 41/0099
Equipment or details not covered by groups e21b15/00 - e21b40/00: specially adapted
Official title: {specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates}
E21B41/0099 (Equipment or details not covered by groups e21b15/00 - e21b40/00: specially adapted) appears on 190 US grants and 212 published applications in this corpus.
Search patents in E21B- Granted patents
- 190
- Published applications
- 212
- Assignees
- 115
- Inventors
- 514
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 8 | 0 |
| 2002 | 1 | 4 |
| 2003 | 2 | 6 |
| 2004 | 3 | 4 |
| 2005 | 4 | 8 |
| 2006 | 2 | 5 |
| 2007 | 5 | 13 |
| 2008 | 3 | 10 |
| 2009 | 7 | 6 |
| 2010 | 2 | 8 |
| 2011 | 4 | 8 |
| 2012 | 5 | 13 |
| 2013 | 5 | 9 |
| 2014 | 10 | 9 |
| 2015 | 8 | 8 |
| 2016 | 13 | 7 |
| 2017 | 4 | 5 |
| 2018 | 4 | 11 |
| 2019 | 12 | 6 |
| 2020 | 10 | 10 |
| 2021 | 13 | 19 |
| 2022 | 14 | 13 |
| 2023 | 13 | 9 |
| 2024 | 15 | 9 |
| 2025 | 3 | 9 |
| 2026 | 5 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for producing natural gas from gas hydrates30 Jun 2026US 12,669,038 B2University of Louisiana at Lafayette
- Well drilling device for undersea in-situ exploitation of natural gas hydrate26 May 2026US 12,637,926 B2Guangzhou Institute of Energy Conversion
- System and method for methane hydrate based production prediction17 Mar 2026US 12,577,856 B2Schlumberger Technology Corporation
- Methane hydrate production equipment and method24 Feb 2026US 12,560,042 B2Baker Hughes Energy Technology UK Limited
- Device for characterizing and testing on-site basic parameter of natural gas hydrate17 Feb 2026US 12,553,339 B2Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences
- Method, system, and machine-readable medium for modeling reflux dolomitization16 Jul 2026US 2026/0202577 A1Saudi Arabian Oil Company
- Subsea mining2 Jul 2026US 2026/0185446 A1Mhwirth AS
- Device for characterizing and testing on-site basic parameter of natural gas hydrate1 Jan 2026US 2026/0002442 A1Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences
- Methods for determining safe density windows of hydrate formation considering mud cakes18 Dec 2025US 2025/0382858 A1Changzhou University
- Method for undersea in-situ exploitation of natural gas hydrates13 Nov 2025US 2025/0347199 A1Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences
Most cited
By later US patents
- Method and system for monitoring smart structures utilizing distributed optical sensors332US 6,913,079 B22005
- Method for dumping and disposing of carbon dioxide gas and apparatus therefor300US 5,261,490 ANKK Corporation · 1993
- Apparatus for electrode heating of earth for recovery of subsurface volatiles and semi-volatiles175US 5,621,845 AIIT Research Institute · 1997
- Method of treating subterranean gas hydrate formations125US 6,148,911 AAtlantic Richfield Company · 2000
- System and method for hydrate recovery60US 5,950,732 ASyntroleum Corporation · 1999