C08G 69/28
Preparatory processes
C08G69/28 (Preparatory processes) appears on 589 US grants and 531 published applications in this corpus.
Search patents in C08G- Granted patents
- 589
- Published applications
- 531
- Assignees
- 310
- Inventors
- 1,592
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 2 | 0 |
| 1978 | 5 | 0 |
| 1979 | 2 | 0 |
| 1980 | 8 | 0 |
| 1981 | 8 | 0 |
| 1982 | 2 | 0 |
| 1983 | 7 | 0 |
| 1984 | 10 | 0 |
| 1985 | 6 | 0 |
| 1986 | 7 | 0 |
| 1987 | 6 | 0 |
| 1988 | 19 | 0 |
| 1989 | 5 | 0 |
| 1990 | 15 | 0 |
| 1991 | 10 | 0 |
| 1992 | 9 | 0 |
| 1993 | 13 | 0 |
| 1994 | 18 | 0 |
| 1995 | 10 | 0 |
| 1996 | 17 | 0 |
| 1997 | 14 | 0 |
| 1998 | 11 | 0 |
| 1999 | 10 | 0 |
| 2000 | 15 | 0 |
| 2001 | 15 | 3 |
| 2002 | 5 | 13 |
| 2003 | 18 | 15 |
| 2004 | 17 | 10 |
| 2005 | 10 | 10 |
| 2006 | 4 | 4 |
| 2007 | 6 | 14 |
| 2008 | 2 | 9 |
| 2009 | 1 | 8 |
| 2010 | 7 | 16 |
| 2011 | 2 | 28 |
| 2012 | 7 | 18 |
| 2013 | 14 | 31 |
| 2014 | 29 | 17 |
| 2015 | 15 | 28 |
| 2016 | 19 | 59 |
| 2017 | 35 | 37 |
| 2018 | 23 | 27 |
| 2019 | 14 | 16 |
| 2020 | 30 | 35 |
| 2021 | 16 | 27 |
| 2022 | 15 | 24 |
| 2023 | 8 | 26 |
| 2024 | 19 | 25 |
| 2025 | 14 | 14 |
| 2026 | 7 | 17 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Copolyamide and polymer film containing at least one diamine, a dicarboxylic acid and 1,5-diamino-3-oxapentane25 Aug 2026US 12,715,963 B2BASF SE
- Apparatus and process for preparing polyamide21 Jul 2026US 12,685,988 B2Hanwha Solutions Corporation
- Composition for improving softness of tissue and/or towel products12 May 2026US 12,624,503 B2Solenis Technologies, L.P.
- High molecular weight polyamides and CoPolyamides with uniform RV and low gel content28 Apr 2026US 12,612,491 B2Ascend Performance Materials Operations LLC
- Preparation method of Ti3C2TX MXene quantum dot (MQD)-modified polyamide (PA) reverse-osmosis (RO) membrane7 Apr 2026US 12,594,529 B2Research Institute of Chemical Defense, PLA Academy of Military Sciences
- Integrated System and Process for Producing High Performance Polyamides from Circular Components8 Oct 2026US 2026/0308322 A1Celanese Polymers Holding, Inc.
- Polyamides produced from used tires1 Oct 2026US 2026/0297256 A1
- Polyamide-based mixed matrix membrane for oil-water separation24 Sep 2026US 2026/0286076 A1King Fahd University of Petroleum and Minerals
- Isomerization of cyclohexenedicarboxylic acid and its derivatives17 Sep 2026US 2026/0274780 A1Iowa State University Research Foundation, Inc.
- Polyamide fabrics with reduced carbon footprint on dyeing10 Sep 2026US 2026/0265995 A1Nilit Ltd.
Most cited
By later US patents
- Interfacially synthesized reverse osmosis membrane312US 4,277,344 AFilmtec Corporation · 1981
- Reverse osmosis membrane95US 4,259,183 AMidwest Research Institute · 1981
- Encapsulation of labile biological material91US 4,324,683 ADamon Corporation · 1982
- Photoinitiator with phase change properties and gellant affinity64US 7,279,587 B2Xerox Corporation · 2007
- Continuous preparation of nylon from aqueous salt solution in precondensation zone having baffles63US 4,540,772 ABASF SE · 1985