C08G 2/28
Post-polymerisation treatments
C08G2/28 (Post-polymerisation treatments) appears on 38 US grants and 22 published applications in this corpus.
Search patents in C08G- Granted patents
- 38
- Published applications
- 22
- Assignees
- 21
- Inventors
- 120
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 1 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 4 |
| 2009 | 0 | 1 |
| 2010 | 1 | 1 |
| 2011 | 1 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 1 | 1 |
| 2015 | 1 | 1 |
| 2016 | 0 | 1 |
| 2017 | 3 | 2 |
| 2018 | 2 | 1 |
| 2019 | 0 | 0 |
| 2020 | 0 | 2 |
| 2021 | 1 | 2 |
| 2022 | 1 | 1 |
| 2023 | 0 | 1 |
| 2024 | 3 | 0 |
| 2025 | 0 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for the production of stable polyoxymethylene copolymers (cPOM)22 Sep 2026US 12,742,033 B2BASF SE
- Oxymethylene-copolymer manufacturing method23 Apr 2024US 11,965,058 B2Mitsubishi Gas Chemical Company, Inc.
- Ammonia and ammonium hydroxide stabilizers for paraformaldehyde13 Feb 2024US 11,897,996 B2Celanese International Corporation
- Oxymethylene copolymer resin composition and method for producing same13 Feb 2024US 11,898,033 B2Mitsubishi Gas Chemical Company, Inc.
- Process for removal of volatile compounds from tackifiers15 Nov 2022US 11,498,997 B2BASF SE
- Method for the deactivation of an acid catalyst during the production process of a polyoxymethylene copolymer23 Jul 2026US 2026/0209432 A1Base SE
- Nitrogen-containing compounds and preparation method thereof, anionic resin, and anionic exchange membrane31 Jul 2025US 2025/0243309 A1EVE Hydrogen Energy Co., LTD.
- Oxymethylene copolymer resin composition and method for producing same20 Apr 2023US 2023/0120116 A1Mitsubishi Gas Chemical Company, Inc.
- Ammonia and ammonium hydroxide stabilizers for paraformaldehyde3 Feb 2022US 2022/0033559 A1Celanese International Corporation
- Method for the production of stable polyoxymethylene copolymers (cpom)23 Sep 2021US 2021/0292461 A1BASF SE
Most cited
By later US patents
- Continuous process for removing unstable components from crude oxymethylene copolymer33US 5,144,005 AHoechst Aktiengesellschaft · 1992
- Process for the preparation of polyacetal copolymers21US 5,587,449 AHoechst Aktiengesellschaft · 1996
- Process for preparing polyacetal copolymer18US 5,844,059 APolyplastics Co., Ltd. · 1998
- Stabilized oxymethylene copolymer composition15US 4,342,680 AMitsubishi Gas Chemical Company, Inc. · 1982
- Process for preparing oxymethylene polymers14US 4,087,411 AMitsubishi Gas Chemical Company, Inc. · 1978