C08F 4/61927
Two cyclopentadienyl rings being mutually bridged
Official title: {two cyclopentadienyl rings being mutually bridged}
C08F4/61927 (Two cyclopentadienyl rings being mutually bridged) appears on 116 US grants and 17 published applications in this corpus.
Search patents in C08F- Granted patents
- 116
- Published applications
- 17
- Assignees
- 35
- Inventors
- 200
- Latest grant
- 6 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 7 | 0 |
| 1996 | 7 | 0 |
| 1997 | 15 | 0 |
| 1998 | 15 | 0 |
| 1999 | 9 | 0 |
| 2000 | 14 | 0 |
| 2001 | 16 | 0 |
| 2002 | 10 | 0 |
| 2003 | 3 | 3 |
| 2004 | 2 | 0 |
| 2005 | 1 | 1 |
| 2006 | 1 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 1 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 1 | 2 |
| 2019 | 1 | 1 |
| 2020 | 0 | 2 |
| 2021 | 1 | 0 |
| 2022 | 2 | 1 |
| 2023 | 0 | 2 |
| 2024 | 3 | 1 |
| 2025 | 1 | 2 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- 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
- Modulating co-monomer selectivity using non-covalent dispersion interactions in group 4 olefin polymerization catalysts2 Jan 2024US 11,859,041 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
- 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
- High porosity fluorided silica-coated alumina activator-supports and uses thereof in metallocene-based catalyst systems for olefin polymerization7 Dec 2023US 2023/0391897 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