C08F 4/65922
Containing at least two cyclopentadienyl rings, fused or not
Official title: {containing at least two cyclopentadienyl rings, fused or not}
C08F4/65922 (Containing at least two cyclopentadienyl rings, fused or not) appears on 2,045 US grants and 1,682 published applications in this corpus.
Search patents in C08F- Granted patents
- 2,045
- Published applications
- 1,682
- Assignees
- 303
- Inventors
- 2,696
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 3 | 0 |
| 1990 | 10 | 0 |
| 1991 | 13 | 0 |
| 1992 | 11 | 0 |
| 1993 | 21 | 0 |
| 1994 | 22 | 0 |
| 1995 | 36 | 0 |
| 1996 | 42 | 0 |
| 1997 | 70 | 0 |
| 1998 | 56 | 0 |
| 1999 | 43 | 0 |
| 2000 | 72 | 0 |
| 2001 | 108 | 31 |
| 2002 | 112 | 87 |
| 2003 | 103 | 100 |
| 2004 | 74 | 101 |
| 2005 | 81 | 81 |
| 2006 | 66 | 52 |
| 2007 | 52 | 58 |
| 2008 | 35 | 61 |
| 2009 | 36 | 52 |
| 2010 | 41 | 57 |
| 2011 | 48 | 59 |
| 2012 | 47 | 61 |
| 2013 | 60 | 71 |
| 2014 | 72 | 61 |
| 2015 | 55 | 68 |
| 2016 | 77 | 85 |
| 2017 | 75 | 83 |
| 2018 | 64 | 73 |
| 2019 | 72 | 85 |
| 2020 | 65 | 54 |
| 2021 | 80 | 96 |
| 2022 | 62 | 80 |
| 2023 | 53 | 38 |
| 2024 | 37 | 45 |
| 2025 | 42 | 19 |
| 2026 | 23 | 24 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Olefinic polymer, and method for preparing same15 Sep 2026US 12,735,515 B2Hanwha Solutions Corporation
- Ethylene copolymer and method for preparation thereof and composition and crosslinked polymer and tire1 Sep 2026US 12,723,117 B2China Petroleum & Chemical Corporation
- Ethylene-octene copolymers with improved property profile1 Sep 2026US 12,723,118 B2Borealis AG
- Glass fiber composite30 Jun 2026US 12,668,673 B2Borealis AG
- Dual catalyst system for producing high density polyethylenes with long chain branching26 May 2026US 12,637,526 B2Chevron Phillips Chemical Company LP
- Asymmetrical hafnium metallocenes10 Sep 2026US 2026/0265283 A1Dow Global Technologies LLC
- Symmetrical hafnium metallocene for making polymers with broad-orthogonal composition distributions10 Sep 2026US 2026/0265284 A1Dow Global Technologies LLC
- Dual Catalyst System for Producing High Density Polyethylenes With Long Chain Branching10 Sep 2026US 2026/0265420 A1Chevron Phillips Chemical Company LP
- Polyolefin compositions for rotomolding10 Sep 2026US 2026/0265429 A1Dow Global Technologies LLC
- Symmetrical zirconium metallocenes having isobutyl cyclopentadienyl ligands27 Aug 2026US 2026/0250309 A1Dow Global Technologies LLC
Most cited
By later US patents
- Ionic metallocene catalyst compositions596US 5,198,401 AExxon Chemical Patents Inc. · 1993
- Catalyst system of enhanced productivity544US 5,153,157 AExxon Chemical Patents Inc. · 1992
- Process and catalyst for polyolefin density and molecular weight control529US 5,324,800 AExxon Chemical Patents Inc. · 1994
- Hafnium metallocene catalyst for the polymerization of olefins498US 4,794,096 AFina Technology, Inc. · 1988
- Process and catalyst for producing reactor blend polyolefins458US 4,937,299 AExxon Research & Engineering Co. · 1990