E21B 43/35
Specially adapted for separating solids
Official title: {specially adapted for separating solids (down-hole drilling fluid separation systems E21B21/002; separating solids from drilling fluids E21B21/065)}
E21B43/35 (Specially adapted for separating solids) appears on 595 US grants and 631 published applications in this corpus.
Search patents in E21B- Granted patents
- 595
- Published applications
- 631
- Assignees
- 349
- Inventors
- 1,221
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 4 | 0 |
| 1978 | 6 | 0 |
| 1979 | 5 | 0 |
| 1980 | 3 | 0 |
| 1981 | 1 | 0 |
| 1982 | 7 | 0 |
| 1983 | 11 | 0 |
| 1984 | 7 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 6 | 0 |
| 1988 | 4 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 4 | 0 |
| 1992 | 4 | 0 |
| 1993 | 4 | 0 |
| 1994 | 2 | 0 |
| 1995 | 3 | 0 |
| 1996 | 3 | 0 |
| 1997 | 4 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 8 | 0 |
| 2001 | 12 | 1 |
| 2002 | 8 | 2 |
| 2003 | 5 | 6 |
| 2004 | 5 | 10 |
| 2005 | 5 | 4 |
| 2006 | 9 | 9 |
| 2007 | 6 | 4 |
| 2008 | 4 | 10 |
| 2009 | 6 | 12 |
| 2010 | 10 | 17 |
| 2011 | 10 | 19 |
| 2012 | 9 | 19 |
| 2013 | 22 | 34 |
| 2014 | 18 | 39 |
| 2015 | 23 | 51 |
| 2016 | 14 | 36 |
| 2017 | 29 | 40 |
| 2018 | 32 | 47 |
| 2019 | 37 | 54 |
| 2020 | 52 | 42 |
| 2021 | 32 | 28 |
| 2022 | 32 | 28 |
| 2023 | 27 | 34 |
| 2024 | 31 | 28 |
| 2025 | 26 | 30 |
| 2026 | 24 | 27 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Systems and methods for generation of hydrogen by in-situ (subsurface) serpentinization and carbonization of mafic or ultramafic rock25 Aug 2026US 12,716,336 B2Ohio State Innovation Foundation
- Natural gas system for on-site processing25 Aug 2026US 12,716,341 B2Nacelle Logistics LLC
- Sand separation system with continuous sand disposal25 Aug 2026US 12,716,342 B2
- System for removing solids from a separator and method therefor28 Jul 2026US 12,691,392 B2Expro North Sea Limited
- Pressure boosting system for multi-phase crude oil28 Jul 2026US 12,692,988 B2Al-Khorayef Petroleum Company
- Automated Plug Catcher Flushing System8 Oct 2026US 2026/0309017 A1
- Subterranean solids fallback protection device1 Oct 2026US 2026/0298065 A1Fallback LLC
- Sand collector for sucker rod pump24 Sep 2026US 2026/0286825 A1Daniel J. Snyder
- Artificial lift system with annular velocity string24 Sep 2026US 2026/0286826 A1
- Desander for a downhole assembly24 Sep 2026US 2026/0286827 A1
Most cited
By later US patents
- In situ retorting of oil shale with pulsed water purge317US 4,637,464 AAmoco Corporation · 1987
- Disposal of produced formation fines during oil recovery300US 4,787,452 AMobil Oil Corporation · 1988
- Method of retorting oil shale by velocity flow of super-heated air250US 4,384,614 AJustheim Pertroleum Company · 1983
- Hydraulic fracturing system and method179US 9,840,897 B22017
- Method and apparatus for recovery of fluids produced in in-situ retorting of oil shale150US 4,119,349 AGulf Oil Corporation · 1978