C08F 222/04
Anhydrides
Official title: Anhydrides, e.g. cyclic anhydrides
C08F222/04 (Anhydrides) appears on 508 US grants and 531 published applications in this corpus.
Search patents in C08F- Granted patents
- 508
- Published applications
- 531
- Assignees
- 328
- Inventors
- 1,542
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 9 | 0 |
| 1978 | 6 | 0 |
| 1979 | 5 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 3 | 0 |
| 1983 | 8 | 0 |
| 1984 | 2 | 0 |
| 1985 | 3 | 0 |
| 1986 | 4 | 0 |
| 1987 | 5 | 0 |
| 1988 | 2 | 0 |
| 1989 | 4 | 0 |
| 1990 | 6 | 0 |
| 1991 | 14 | 0 |
| 1992 | 7 | 0 |
| 1993 | 9 | 0 |
| 1994 | 3 | 0 |
| 1995 | 7 | 0 |
| 1996 | 4 | 0 |
| 1997 | 3 | 0 |
| 1998 | 5 | 0 |
| 1999 | 7 | 0 |
| 2000 | 7 | 0 |
| 2001 | 12 | 9 |
| 2002 | 10 | 20 |
| 2003 | 18 | 14 |
| 2004 | 15 | 12 |
| 2005 | 5 | 5 |
| 2006 | 4 | 13 |
| 2007 | 6 | 16 |
| 2008 | 5 | 24 |
| 2009 | 4 | 17 |
| 2010 | 9 | 17 |
| 2011 | 14 | 19 |
| 2012 | 8 | 16 |
| 2013 | 10 | 19 |
| 2014 | 24 | 22 |
| 2015 | 16 | 18 |
| 2016 | 11 | 20 |
| 2017 | 14 | 17 |
| 2018 | 17 | 34 |
| 2019 | 19 | 20 |
| 2020 | 22 | 26 |
| 2021 | 23 | 39 |
| 2022 | 27 | 45 |
| 2023 | 21 | 41 |
| 2024 | 23 | 30 |
| 2025 | 21 | 9 |
| 2026 | 17 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Polyoxymethylene compositions6 Oct 2026US 12,753,302 B2Delrin USA, LLC
- Process for the production of biodegradable superabsorbent polymer with high absorbency under load based on styrene maleic acid copolymers and biopolymer15 Sep 2026US 12,734,270 B2Polygreen Ltd
- Heat-curable bismaleimide resin composition15 Sep 2026US 12,735,535 B2Shin-Etsu Chemical Co., Ltd.
- Curable composition8 Sep 2026US 12,729,253 B2LG Energy Solution, Ltd.
- Formulation system for compositions for enhancing nitrogen stabilizers16 Jun 2026US 12,655,072 B2Synsus Private Label Partners, LLC
- Recyclable polymer aerogel, cold-storage phase-change composite material, preparation methods and uses25 Jun 2026US 2026/0176400 A1China Petroleum & Chemical Corporation
- Aqueous resin, aqueous coating material, and anti-corrosion coating layer28 May 2026US 2026/0146179 A1Industrial Technology Research Institute
- Composite aerogel, recyclable heat-storage phase-change composite material with photothermal conversion function, and preparation methods therefor and use7 May 2026US 2026/0125530 A1China Petroleum & Chemical Corporation
- Thermoplastic resin composition7 May 2026US 2026/0125547 A1LG Chem.Ltd.
- Maleimide resin mixture, curable resin composition, varnish, and cured product thereof23 Apr 2026US 2026/0109801 A1Nippon Kayaku Kabushiki Kaisha
Most cited
By later US patents
- Polymer and a forming method of a micro pattern using the same482US 6,316,162 B1Hyundai Electronics Industries Co., Ltd. · 2001
- Photoresist polymer and photoresist composition containing the same471US 7,279,256 B2Hynix Semiconductor Inc. · 2007
- Co-polymers based on oxyalkyleneglycol alkenyl ethers and unsaturated dicarboxylic acid derivatives127US 5,798,425 ASKW Trostberg Aktiengesellschaft · 1998
- Pegylated nanoparticles121US 8,628,801 B2Universidad De Navarra · 2014
- Photonic structures from self assembly of brush block copolymers and polymer blends57US 9,453,943 B2California Institute of Technology · 2016