E21B 19/089
With a spring or an additional weight
Official title: with a spring or an additional weight
E21B19/089 (With a spring or an additional weight) appears on 13 US grants and 10 published applications in this corpus.
Search patents in E21B- Granted patents
- 13
- Published applications
- 10
- Assignees
- 12
- Inventors
- 22
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 1 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 0 |
| 2020 | 1 | 1 |
| 2021 | 0 | 1 |
| 2022 | 1 | 1 |
| 2023 | 0 | 0 |
| 2024 | 2 | 2 |
| 2025 | 1 | 3 |
| 2026 | 3 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Device for generating an axial load in a drill string assembly6 Oct 2026US 12,753,660 B2Pgi Holding Limited
- Spring bail cylinder apparatus11 Aug 2026US 12,704,028 B2
- Counterbalance systems and related methods for catwalk systems21 Apr 2026US 12,607,077 B2Forum US, Inc.
- Piling machine and cast-in-place pile14 Oct 2025US 12,442,260 B2Hainan Zhuodian High Tech Development Co., Ltd.
- Counterbalance systems and related methods for catwalk systems3 Dec 2024US 12,158,045 B2Forum US, Inc.
- Counterbalance systems and related methods for catwalk systems21 Aug 2025US 2025/0263988 A1Forum US, Inc.
- Spring bail cylinder apparatus15 May 2025US 2025/0154834 A1
- Portal pile driver and cast-in-place pile construction method6 Feb 2025US 2025/0043642 A1Hainan Zhuodian High Tech Development Co., Ltd.
- Counterbalance systems and related methods for catwalk systems10 Oct 2024US 2024/0337164 A1Forum US, Inc.
- Compensating rig elevator13 Jun 2024US 2024/0191584 A1
Most cited
By later US patents
- Method of operating an earth boring machine16US 5,289,887 ATracto-Technik Paul Schmidt Spezialmaschinen · 1994
- Method of making a conductive downhole wire line system14US 6,148,925 A2000
- Pipe connection system9US 8,281,867 B2National Oilwell Varco, L. P. · 2012
- Seabed analysis7US 6,526,818 B1WS Atkins Consultants Limited · 2003
- Draw works traveling block motion control apparatus5US 4,591,131 A1986