B01J 31/1875
Phosphinites
Official title: {Phosphinites (R2P(OR), their isomeric phosphine oxides (R3P=O) and RO-substitution derivatives thereof)}
B01J31/1875 (Phosphinites) appears on 271 US grants and 202 published applications in this corpus.
Search patents in B01J- Granted patents
- 271
- Published applications
- 202
- Assignees
- 117
- Inventors
- 641
- Latest grant
- 2 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 8 | 0 |
| 1981 | 9 | 0 |
| 1982 | 4 | 0 |
| 1983 | 4 | 0 |
| 1984 | 3 | 0 |
| 1985 | 5 | 0 |
| 1986 | 6 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 4 | 0 |
| 1992 | 3 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 6 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 4 | 0 |
| 2000 | 12 | 0 |
| 2001 | 8 | 2 |
| 2002 | 7 | 6 |
| 2003 | 8 | 10 |
| 2004 | 6 | 9 |
| 2005 | 11 | 6 |
| 2006 | 6 | 11 |
| 2007 | 4 | 13 |
| 2008 | 7 | 7 |
| 2009 | 4 | 6 |
| 2010 | 4 | 6 |
| 2011 | 9 | 9 |
| 2012 | 5 | 5 |
| 2013 | 6 | 2 |
| 2014 | 5 | 10 |
| 2015 | 6 | 8 |
| 2016 | 15 | 15 |
| 2017 | 10 | 10 |
| 2018 | 7 | 13 |
| 2019 | 16 | 9 |
| 2020 | 8 | 7 |
| 2021 | 8 | 5 |
| 2022 | 7 | 6 |
| 2023 | 6 | 7 |
| 2024 | 6 | 8 |
| 2025 | 5 | 10 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Cyclopentadienyl/adamantyl phosphinimine zirconium and hafnium complexes2 Dec 2025US 12,486,342 B2NOVA Chemicals (International) S.A.
- Sterically hindered phosphino-urea supported nickel (II) or palladium (II) catalysts for the copolymerization of ethylene and polar comonomers3 Jun 2025US 12,319,758 B2Dow Global Technologies LLC
- Sterically hindered phosphine-amide supported nickel (II) or palladium (II) catalysts for the copolymerization of ethylene and polar comonomers3 Jun 2025US 12,319,775 B2Dow Global Technologies LLC
- Organometallic complex, olefin polymerization catalyst system and polymerization process15 Apr 2025US 12,275,751 B2NOVA Chemicals (International) S.A.
- Spiro-bisphosphorous compound, and preparation and application thereof14 Jan 2025US 12,195,489 B2Guangdong Oxo Chem Ltd.
- Ligand Compound, Organic Chromium Compound, and Catalyst Compositions Containing the Same3 Sep 2026US 2026/0257213 A1LG Chem.Ltd.
- Catalyst composition for olefin oligomerization5 Mar 2026US 2026/0061408 A1Industrial Technology Research Institute
- Ligand Compound, Organic Chromium Compound, and Catalyst Compositions Containing the Same18 Dec 2025US 2025/0381558 A1LG Chem.Ltd.
- Processes for converting unsaturated polyethylene to alkene products4 Dec 2025US 2025/0368586 A1Dow Global Technologies LLC
- Ligand Compound, Organic Chromium Compound, and Catalyst Composition Including the Same30 Oct 2025US 2025/0333427 A1LG Chem.Ltd.
Most cited
By later US patents
- Olefin trimerisation using a catalyst comprising a source of chromium, molybdenum or tungsten and a ligand containing at least one phosphorous, arsenic or antimony atom bound to at least one (hetero)hydrocarbyl group65US 6,800,702 B2BP Chemicals Limited · 2004
- Oligomerisation of olefinic compounds in an aliphatic medium50US 7,964,763 B2Sasol Technology (Pty) Ltd · 2011
- Asymmetric syntheses48US 5,360,938 AUnion Carbide Chemicals & Plastics Technology Corporation · 1994
- Diolefin dimerization catalyst and method for producing nitrosyl halides of iron triad metals45US 4,234,454 APhillips Petroleum Company · 1980
- Catalyst for the selective production of ethanol and methanol directly from synthesis gas43US 4,333,852 AUnion Carbide Corporation · 1982