C08F 4/61922
Containing at least two cyclopentadienyl rings, fused or not
Official title: {containing at least two cyclopentadienyl rings, fused or not}
C08F4/61922 (Containing at least two cyclopentadienyl rings, fused or not) appears on 223 US grants and 45 published applications in this corpus.
Search patents in C08F- Granted patents
- 223
- Published applications
- 45
- Assignees
- 70
- Inventors
- 400
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 4 | 0 |
| 1995 | 11 | 0 |
| 1996 | 15 | 0 |
| 1997 | 29 | 0 |
| 1998 | 24 | 0 |
| 1999 | 20 | 0 |
| 2000 | 26 | 0 |
| 2001 | 26 | 1 |
| 2002 | 23 | 1 |
| 2003 | 5 | 7 |
| 2004 | 4 | 0 |
| 2005 | 1 | 4 |
| 2006 | 2 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 2 | 4 |
| 2011 | 3 | 3 |
| 2012 | 1 | 0 |
| 2013 | 0 | 3 |
| 2014 | 1 | 0 |
| 2015 | 2 | 0 |
| 2016 | 1 | 0 |
| 2017 | 0 | 2 |
| 2018 | 3 | 7 |
| 2019 | 3 | 1 |
| 2020 | 3 | 2 |
| 2021 | 1 | 0 |
| 2022 | 2 | 1 |
| 2023 | 0 | 3 |
| 2024 | 3 | 1 |
| 2025 | 1 | 2 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Catalyst comprising mixed transition metal compounds, polyolefin prepared using the same, and processes for preparing the same26 May 2026US 12,637,525 B2Hanwha Solutions Corporation
- High porosity fluorided silica-coated alumina activator-supports and uses thereof in metallocene-based catalyst systems for olefin polymerization6 Jan 2026US 12,516,137 B2Chevron Phillips Chemical Company LP
- High porosity fluorided silica-coated alumina activator-supports and uses thereof in metallocene-based catalyst systems for olefin polymerization3 Jun 2025US 12,319,770 B2Chevron Phillips Chemical Company LP
- High porosity fluorided silica-coated alumina activator-supports and uses thereof in metallocene-based catalyst systems for olefin polymerization19 Nov 2024US 12,146,018 B2Chevron Phillips Chemical Company LP
- High porosity fluorided silica-coated alumina activator-supports and uses thereof in metallocene-based catalyst systems for olefin polymerization27 Feb 2024US 11,912,809 B2Chevron Phillips Chemical Company LP
- High porosity fluorided silica-coated alumina activator-supports and uses thereof in metallocene-based catalyst systems for olefin polymerization30 Jul 2026US 2026/0217873 A1Chevron Phillips Chemical Company LP
- Pipes including high density multimodal polyethylene compositions30 Jul 2026US 2026/0218818 A1Dow Global Technologies LLC
- High porosity fluorided silica-coated alumina activator-supports and uses thereof in metallocene-based catalyst systems for olefin polymerization14 Aug 2025US 2025/0257155 A1Chevron Phillips Chemical Company LP
- High porosity fluorided silica-coated alumina activator-supports and uses thereof in metallocene-based catalyst systems for olefin polymerization6 Feb 2025US 2025/0043037 A1Chevron Phillips Chemical Company LP
- High porosity fluorided silica-coated alumina activator-supports and uses thereof in metallocene-based catalyst systems for olefin polymerization9 May 2024US 2024/0150501 A1Chevron Phillips Chemical Company LP
Most cited
By later US patents
- Silicon-bridged transition metal compounds390US 5,017,714 AExxon Chemical Patents Inc. · 1991
- Silicon-bridged transition metal compounds192US 5,120,867 A1992
- Preparation of metallocene catalysts for polymerization of olefins184US 5,387,568 AFina Technology, Inc. · 1995
- Process and catalyst for producing syndiotactic polyolefins169US 5,155,080 AFina Technology, Inc. · 1992
- Metallocenes and processes therefor and therewith148US 5,399,636 APhillips Petroleum Company · 1995