B01J 31/2295
Cyclic compounds
Official title: {Cyclic compounds, e.g. cyclopentadienyls}
B01J31/2295 (Cyclic compounds) appears on 1,257 US grants and 1,060 published applications in this corpus.
Search patents in B01J- Granted patents
- 1,257
- Published applications
- 1,060
- Assignees
- 549
- Inventors
- 2,702
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 11 | 0 |
| 1978 | 6 | 0 |
| 1979 | 9 | 0 |
| 1980 | 11 | 0 |
| 1981 | 16 | 0 |
| 1982 | 9 | 0 |
| 1983 | 6 | 0 |
| 1984 | 9 | 0 |
| 1985 | 9 | 0 |
| 1986 | 4 | 0 |
| 1987 | 8 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 8 | 0 |
| 1991 | 8 | 0 |
| 1992 | 9 | 0 |
| 1993 | 13 | 0 |
| 1994 | 11 | 0 |
| 1995 | 23 | 0 |
| 1996 | 25 | 0 |
| 1997 | 20 | 0 |
| 1998 | 26 | 0 |
| 1999 | 40 | 0 |
| 2000 | 45 | 0 |
| 2001 | 65 | 13 |
| 2002 | 58 | 36 |
| 2003 | 38 | 37 |
| 2004 | 31 | 43 |
| 2005 | 41 | 47 |
| 2006 | 24 | 23 |
| 2007 | 25 | 23 |
| 2008 | 15 | 24 |
| 2009 | 20 | 22 |
| 2010 | 15 | 43 |
| 2011 | 26 | 30 |
| 2012 | 16 | 32 |
| 2013 | 33 | 65 |
| 2014 | 29 | 63 |
| 2015 | 56 | 90 |
| 2016 | 65 | 70 |
| 2017 | 65 | 68 |
| 2018 | 52 | 50 |
| 2019 | 54 | 68 |
| 2020 | 44 | 32 |
| 2021 | 40 | 35 |
| 2022 | 27 | 32 |
| 2023 | 20 | 29 |
| 2024 | 31 | 37 |
| 2025 | 17 | 27 |
| 2026 | 11 | 21 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Internal diene compounds and their Pt complexes for catalyzed reactions including hydrosilylation29 Sep 2026US 12,746,537 B2
- Methods for preparing (2S,3R,4R)-4,5-dihydroxyisoleucine derivative and intermediates thereof15 Sep 2026US 12,735,384 B2Inner Mongolia Duhe Innovation R & D Tech Co., Ltd
- Catalyst, method of preparation, and methods involving hydrosilylation14 Jul 2026US 12,679,916 B2The Board of Trustees of the University of Illinois
- Hydrogen storage based on aqueous formate- bicarbonate (hydrogen carbonate) equilibrium9 Jun 2026US 12,649,654 B2Hydrogen Revolution Hungary Kft.
- Enantioselective hydrogenation of 4-substituted 1,2-dihydroquinolines in presence of a chiral iridium catalyst2 Jun 2026US 12,643,860 B2Bayer Aktiengesellschaft
- Selective olefin oligomerization with transition metal amine bis(phenolate) catalysts8 Oct 2026US 2026/0308083 A1Chevron 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
- Intermolecular cyclopropanation of unsaturated hydrocarbons20 Aug 2026US 2026/0242327 A1The Penn State Research Foundation
- Catalyst for sp3-carbon-hydrogen-bond primary amination reaction, and method for preparing primary amine compound13 Aug 2026US 2026/0234096 A1West China Second University Hospital, Sichuan University
Most cited
By later US patents
- Catalyst system of enhanced productivity544US 5,153,157 AExxon Chemical Patents Inc. · 1992
- Compositions that can produce polymers334US 6,300,271 B1Phillips Petroleum Company · 2001
- Organometal catalyst compositions329US 6,355,594 B1Phillips Petroleum Company · 2002
- Organometal catalyst compositions300US 6,376,415 B1Phillips Petroleum Company · 2002
- Silica-coated alumina activator-supports for metallocene catalyst compositions292US 7,884,163 B2Chevron Phillips Chemical Company LP · 2011