C09K 8/203
Wood derivatives
Official title: {Wood derivatives, e.g. lignosulfonate, tannin, tall oil, sulfite liquor}
C09K8/203 (Wood derivatives) appears on 66 US grants and 22 published applications in this corpus.
Search patents in C09K- Granted patents
- 66
- Published applications
- 22
- Assignees
- 36
- Inventors
- 94
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 7 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 4 | 0 |
| 1985 | 1 | 0 |
| 1986 | 5 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 4 | 0 |
| 1990 | 1 | 0 |
| 1991 | 4 | 0 |
| 1992 | 3 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 1 | 3 |
| 2014 | 0 | 0 |
| 2015 | 0 | 1 |
| 2016 | 1 | 0 |
| 2017 | 1 | 2 |
| 2018 | 2 | 2 |
| 2019 | 4 | 4 |
| 2020 | 2 | 1 |
| 2021 | 3 | 2 |
| 2022 | 0 | 0 |
| 2023 | 1 | 0 |
| 2024 | 0 | 2 |
| 2025 | 0 | 0 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Lignin-based compositions and related methods26 May 2026US 12,637,605 B2LignoSol IP Limited
- Lignin-based drilling fluids and related methods14 Apr 2026US 12,600,894 B2LignoSol IP Limited
- Methods for drilling wellbores using thinner compositions5 Dec 2023US 11,834,594 B2Chevron Phillips Chemical Company LP
- Well treatment fluid having biodegradable fluid loss control agent2 Nov 2021US 11,162,012 B2Halliburton Energy Services.Inc.
- Drill fluid and method for tunneling26 Oct 2021US 11,155,742 B2Canadian Energy Services L.P.
- Lignin-based compositions and related methods10 Sep 2026US 2026/0265600 A1LignoSol IP Limited
- Lignin-based drilling fluids and related methods7 Nov 2024US 2024/0368448 A1LignoSol IP Limited
- Lignin-based compositions and related methods6 Jun 2024US 2024/0182772 A1LignoSol IP Limited
- Methods for Drilling Wellbores Using Thinner Compositions16 Dec 2021US 2021/0388253 A1Chevron Phillips Chemical Company LP
- Well treatment fluid having biodegradable fluid loss control agent7 Oct 2021US 2021/0309907 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Drilling and cementing extended reach boreholes70US 5,343,950 AShell Oil Company · 1994
- Well working compositions, method of decreasing the seepage loss from such compositions, and additive therefor68US 5,004,553 AVenture Innovations, Inc. · 1991
- Method of drilling with fluid including nut cork and drilling fluid additive49US 5,484,028 AGrinding & Sizing Co., Inc. · 1996
- Well completion and work over fluid and method of use46US 4,175,042 ATexas Brine Corporation · 1979
- Drilling fluid45US 4,704,214 APhillips Petroleum Company · 1987