C04B 24/2652
Nitrogen containing polymers
Official title: {Nitrogen containing polymers, e.g. polyacrylamides, polyacrylonitriles}
C04B24/2652 (Nitrogen containing polymers) appears on 251 US grants and 265 published applications in this corpus.
Search patents in C04B- Granted patents
- 251
- Published applications
- 265
- Assignees
- 131
- Inventors
- 799
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 5 | 0 |
| 1995 | 4 | 0 |
| 1996 | 4 | 0 |
| 1997 | 6 | 0 |
| 1998 | 8 | 0 |
| 1999 | 3 | 0 |
| 2000 | 6 | 0 |
| 2001 | 12 | 5 |
| 2002 | 7 | 7 |
| 2003 | 3 | 6 |
| 2004 | 7 | 14 |
| 2005 | 8 | 10 |
| 2006 | 9 | 4 |
| 2007 | 3 | 9 |
| 2008 | 5 | 8 |
| 2009 | 3 | 2 |
| 2010 | 1 | 8 |
| 2011 | 3 | 12 |
| 2012 | 5 | 10 |
| 2013 | 5 | 12 |
| 2014 | 5 | 15 |
| 2015 | 8 | 13 |
| 2016 | 11 | 12 |
| 2017 | 16 | 15 |
| 2018 | 15 | 17 |
| 2019 | 10 | 16 |
| 2020 | 11 | 9 |
| 2021 | 12 | 18 |
| 2022 | 6 | 8 |
| 2023 | 5 | 8 |
| 2024 | 11 | 17 |
| 2025 | 11 | 9 |
| 2026 | 4 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Dual-scale toughened cement-based composite material and use thereof6 Oct 2026US 12,753,118 B2Qingdao University of Technology
- Uncharged clay blocking agent6 Oct 2026US 12,753,119 B2BASF SE
- In-situ high-strength gradient carbonized material and preparation method thereof28 Apr 2026US 12,612,332 B2Wuhan University of Technology
- Self-healing polymer-modified cements for ambient temperature applications14 Apr 2026US 12,600,669 B2Battelle Memorial Institute
- Method for preparing heat-conductive cement slurry for well cementation30 Dec 2025US 12,509,621 B2Southwest Petroleum University
- Silver containing crosslinked polymers as admixture in cementitious compositions2 Jul 2026US 2026/0184635 A1Katholieke Universiteit Leuven
- In-situ synergistically modified and reinforced cement-based composite material and use thereof28 Aug 2025US 2025/0270139 A1Qingdao University of Technology
- Polymer-silicate admixture system and method28 Aug 2025US 2025/0270140 A1
- Poly (amino acid) rheology modifier compositions and methods of use24 Jul 2025US 2025/0236707 A1Ecovia Renewables Inc.
- Coastal karst cement-based expanding grouting material and preparation method therefor19 Jun 2025US 2025/0197279 A1Shandong University
Most cited
By later US patents
- Hydrolytically stable polymers for use in oil field cementing methods and compositions237US 4,555,269 AHalliburton Company · 1985
- Cement admixture product having improved rheological properties and process of forming same130US 5,643,978 AW. R. Grace & Co.-Conn. · 1997
- Cement and cement composition having improved rheological properties127US 5,393,343 AW. R. Grace & Co.-Conn. · 1995
- Cement admixture product having improved rheological properties and process of forming same115US 5,633,298 AW. R. Grace & Co.-Conn. · 1997
- High early-strength cementitious composition102US 6,858,074 B2Construction Research & Technology GmbH · 2005