C09K 8/90
Of natural origin
Official title: of natural origin, e.g. polysaccharides, cellulose
C09K8/90 (Of natural origin) appears on 676 US grants and 598 published applications in this corpus.
Search patents in C09K- Granted patents
- 676
- Published applications
- 598
- Assignees
- 236
- Inventors
- 1,201
- Latest grant
- 17 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 7 | 0 |
| 1978 | 15 | 0 |
| 1979 | 8 | 0 |
| 1980 | 11 | 0 |
| 1981 | 15 | 0 |
| 1982 | 22 | 0 |
| 1983 | 10 | 0 |
| 1984 | 21 | 0 |
| 1985 | 12 | 0 |
| 1986 | 11 | 0 |
| 1987 | 15 | 0 |
| 1988 | 14 | 0 |
| 1989 | 14 | 0 |
| 1990 | 10 | 0 |
| 1991 | 15 | 0 |
| 1992 | 16 | 0 |
| 1993 | 10 | 0 |
| 1994 | 11 | 0 |
| 1995 | 3 | 0 |
| 1996 | 5 | 0 |
| 1997 | 4 | 0 |
| 1998 | 4 | 0 |
| 1999 | 2 | 0 |
| 2000 | 4 | 0 |
| 2001 | 4 | 2 |
| 2002 | 6 | 3 |
| 2003 | 3 | 5 |
| 2004 | 5 | 9 |
| 2005 | 2 | 12 |
| 2006 | 7 | 20 |
| 2007 | 8 | 14 |
| 2008 | 3 | 17 |
| 2009 | 12 | 12 |
| 2010 | 13 | 22 |
| 2011 | 13 | 24 |
| 2012 | 10 | 27 |
| 2013 | 12 | 18 |
| 2014 | 14 | 35 |
| 2015 | 21 | 48 |
| 2016 | 24 | 70 |
| 2017 | 33 | 61 |
| 2018 | 38 | 44 |
| 2019 | 41 | 48 |
| 2020 | 40 | 24 |
| 2021 | 30 | 30 |
| 2022 | 26 | 17 |
| 2023 | 22 | 7 |
| 2024 | 11 | 13 |
| 2025 | 9 | 13 |
| 2026 | 4 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Hydration systems and methods17 Mar 2026US 12,576,556 B2Schlumberger Technology Corporation
- Brine-tolerant compositions comprising fatty acid or fatty ester reaction products of saccharide polymers10 Feb 2026US 12,545,830 B2Integrity Bio-Chemicals, LLC
- Method and compositions for stimulating subterranean formations10 Feb 2026US 12,545,831 B2King Fahd University of Petroleum and Minerals
- Compositions for enhancing viscosity of subterranean fluids utilizing chelating agents3 Feb 2026US 12,540,271 B2King Fahd University of Petroleum and Minerals
- Functionalized nanoparticles as wetability modifier30 Sep 2025US 12,428,592 B2Schlumberger Technology Corporation
- Brine-tolerant compositions comprising fatty acid or fatty ester reaction products of saccharide polymers21 May 2026US 2026/0139184 A1Integrity Bio-Chemicals, LLC
- Biomass slurry preparation for subterranean injection9 Apr 2026US 2026/0098205 A1
- Functionalized nanoparticles as wetability modifier22 Jan 2026US 2026/0022291 A1Schlumberger Technology Corporation
- Method and compositions for drag reducer in downhole applications11 Dec 2025US 2025/0376616 A1King Fahd University of Petroleum and Minerals
- Method and compositions for stimulating subterranean formations11 Dec 2025US 2025/0376617 A1King Fahd University of Petroleum and Minerals
Most cited
By later US patents
- Subterranean formation treating fluid concentrates, treating fluids and methods250US 6,488,091 B1Halliburton Energy Services.Inc. · 2002
- Foamed well cement slurries, additives and methods177US 6,547,871 B2Halliburton Energy Services.Inc. · 2003
- Foamed well cement slurries, additives and methods174US 6,367,550 B1Halliburton Energy Service, Inc. · 2002
- Methods for stimulating hydrocarbon production156US 6,828,280 B2Schlumberger Technology Corporation · 2004
- Pre-treatment methods for polymer-containing fluids129US 6,138,760 ABJ Services Company · 2000