C08F 4/65927
Two cyclopentadienyl rings being mutually bridged
Official title: {two cyclopentadienyl rings being mutually bridged}
C08F4/65927 (Two cyclopentadienyl rings being mutually bridged) appears on 1,354 US grants and 1,203 published applications in this corpus.
Search patents in C08F- Granted patents
- 1,354
- Published applications
- 1,203
- Assignees
- 199
- Inventors
- 1,926
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 3 | 0 |
| 1991 | 6 | 0 |
| 1992 | 3 | 0 |
| 1993 | 9 | 0 |
| 1994 | 12 | 0 |
| 1995 | 19 | 0 |
| 1996 | 21 | 0 |
| 1997 | 47 | 0 |
| 1998 | 27 | 0 |
| 1999 | 21 | 0 |
| 2000 | 37 | 0 |
| 2001 | 62 | 17 |
| 2002 | 69 | 59 |
| 2003 | 51 | 54 |
| 2004 | 40 | 60 |
| 2005 | 49 | 55 |
| 2006 | 43 | 43 |
| 2007 | 39 | 38 |
| 2008 | 29 | 50 |
| 2009 | 26 | 48 |
| 2010 | 34 | 39 |
| 2011 | 34 | 33 |
| 2012 | 36 | 39 |
| 2013 | 36 | 48 |
| 2014 | 49 | 53 |
| 2015 | 44 | 53 |
| 2016 | 63 | 72 |
| 2017 | 60 | 68 |
| 2018 | 57 | 53 |
| 2019 | 56 | 58 |
| 2020 | 47 | 40 |
| 2021 | 52 | 74 |
| 2022 | 52 | 60 |
| 2023 | 44 | 28 |
| 2024 | 27 | 33 |
| 2025 | 33 | 15 |
| 2026 | 15 | 13 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- 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
- Silicon-bridged transition metal compounds390US 5,017,714 AExxon Chemical Patents Inc. · 1991
- Organometal catalyst compositions329US 6,355,594 B1Phillips Petroleum Company · 2002
- Organometal catalyst compositions298US 6,524,987 B1Phillips Petroleum Company · 2003