C08F 4/56
Alkali metals being the only metals present
Official title: Alkali metals being the only metals present, e.g. Alfin catalysts
C08F4/56 (Alkali metals being the only metals present) appears on 12 US grants and 9 published applications in this corpus.
Search patents in C08F- Granted patents
- 12
- Published applications
- 9
- Assignees
- 14
- Inventors
- 38
- Latest grant
- 24 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 1 | 2 |
| 2007 | 0 | 0 |
| 2008 | 1 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 2 |
| 2014 | 0 | 0 |
| 2015 | 1 | 1 |
| 2016 | 2 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 1 |
| 2021 | 1 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 1 |
| 2024 | 0 | 0 |
| 2025 | 0 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Catalytic system for the stereospecific polymerization of dienes and use thereof in a process for synthesizing diene polymers24 Mar 2026US 12,583,949 B2Compagnie Generale Des Etablissements Michelin
- Polar modifier systems for high vinyl block copolymerization26 Jan 2021US 10,899,864 B2Dynasol Elastómeros, S.A. de C.V.
- Modified conjugated diene rubber, method and composition thereof16 Feb 2016US 9,260,537 B2TSRC Corporation
- Conjugated diene rubber modified with polar alkoxysilane, method and composition thereof16 Feb 2016US 9,260,593 B2TSRC Corporation
- Method for producing (meth)acrylate copolymer9 Jun 2015US 9,051,398 B2Kuraray Co., Ltd.
- Catalytic system for the stereospecific polymerization of dienes and use thereof in a process for synthesizing diene polymers31 Aug 2023US 2023/0272128 A1Centre National de la Recherche Scientifique (CNRS)
- Polar Modifier Systems for High Vinyl Block Copolymerization13 Feb 2020US 2020/0048393 A1Dynasol Elastómeros, S.A. de C.V.
- Method for producing (meth)acrylate copolymer5 Feb 2015US 2015/0038658 A1Kuraray Co., Ltd.
- Modified conjugated diene rubber, method and composition thereof20 Jun 2013US 2013/0158192 A1TSRC Corporation
- Conjugated diene rubber modified with polar alkoxysilane, method and composition thereof13 Jun 2013US 2013/0150522 A1TSRC Corporation
Most cited
By later US patents
- Process and catalyst system for synthesizing random trans SBR with low vinyl microstructure46US 6,103,842 AThe Goodyear Tire & Rubber Company · 2000
- Associations of bases, resulting from the combination of a lithium alkyl or aryl with an alkali metal amide or hydride, polymerization process in which they are used, and product obtained13US 4,435,312 ASociete Nationale des Poudres et Explosifs · 1984
- Associations of bases, resulting from the combination of a lithium alkyl or aryl with an alkali metal amide or hydride, polymerization process in which they are used, and product obtained12US 4,535,135 ASociete Nationale des Poudres et Explosifs · 1985
- Synthesis of macrocyclic polymers with group IIA and IIB metal cyclic organometallic initiators12US 5,677,399 ABridgestone Corporation · 1997
- Preparation of functionalized anionic polymerization initiators8US 7,405,262 B2Bridgestone Corporation · 2008