B01J 31/0268
Phosphonium compounds, i.e. phosphine with an additional hydrogen or carbon atom bonded
Official title: {Phosphonium compounds, i.e. phosphine with an additional hydrogen or carbon atom bonded to phosphorous so as to result in a formal positive charge on phosphorous}
B01J31/0268 (Phosphonium compounds, i.e. phosphine with an additional hydrogen or carbon atom bonded) appears on 207 US grants and 143 published applications in this corpus.
Search patents in B01J- Granted patents
- 207
- Published applications
- 143
- Assignees
- 121
- Inventors
- 481
- Latest grant
- 5 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 5 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 4 | 0 |
| 1982 | 6 | 0 |
| 1983 | 4 | 0 |
| 1984 | 6 | 0 |
| 1985 | 3 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 5 | 0 |
| 1989 | 3 | 0 |
| 1990 | 3 | 0 |
| 1991 | 4 | 0 |
| 1992 | 6 | 0 |
| 1993 | 4 | 0 |
| 1994 | 8 | 0 |
| 1995 | 3 | 0 |
| 1996 | 3 | 0 |
| 1997 | 5 | 0 |
| 1998 | 5 | 0 |
| 1999 | 6 | 0 |
| 2000 | 3 | 0 |
| 2001 | 11 | 3 |
| 2002 | 4 | 3 |
| 2003 | 6 | 9 |
| 2004 | 8 | 9 |
| 2005 | 4 | 5 |
| 2006 | 6 | 3 |
| 2007 | 3 | 9 |
| 2008 | 2 | 4 |
| 2009 | 1 | 4 |
| 2010 | 5 | 8 |
| 2011 | 4 | 5 |
| 2012 | 2 | 4 |
| 2013 | 3 | 9 |
| 2014 | 6 | 8 |
| 2015 | 5 | 4 |
| 2016 | 7 | 12 |
| 2017 | 8 | 3 |
| 2018 | 4 | 6 |
| 2019 | 3 | 6 |
| 2020 | 6 | 4 |
| 2021 | 3 | 8 |
| 2022 | 6 | 6 |
| 2023 | 2 | 1 |
| 2024 | 5 | 2 |
| 2025 | 1 | 2 |
| 2026 | 2 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Spirocyclic compound containing catalyst for use in catalyzing reaction of epoxide compound and carbon dioxide5 May 2026US 12,616,964 B2Shenzhen Capchem Technology Co., Ltd.
- Non-metal catalyst for synthesizing polycarbonate by CO2 and preparation method therefor31 Mar 2026US 12,589,384 B2Wuhan Institute of Technology
- Process for preparing polycarbonate and catalytic system used25 Feb 2025US 12,234,320 B2ENI S. p. A.
- Mono-substituted cyclopentadienes and metal cyclopentadienyl complexes and synthesis methods thereof17 Sep 2024US 12,091,374 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Process for preparing polycarbonates using a catalyst system having a quarternary nitrogen compond and a quarternary phosphorous compound2 Apr 2024US 11,945,909 B2Epc Engineering & Technologies GmbH
- Immobilized quaternary phosphonium salt having phenol domain, method for producing same, and cyclic carbonate production method using same17 Sep 2026US 2026/0274874 A1Shin-Etsu Chemical Co., Ltd.
- Spirocyclic compound containing catalyst for use in catalyzing reaction of epoxide compound and carbon dioxide6 Aug 2026US 2026/0225086 A1Shenzhen Capchem Technology Co., Ltd.
- Catalysts for solvolysis of polyester6 Aug 2026US 2026/0225087 A1Agency for Science, Technology and Research
- Alkoxylation processes using phosphorus and double metal cyanide catalysts23 Jul 2026US 2026/0208173 A1Dow Global Technologies LLC
- Low-odor phosphazene catalyst and use thereof30 Apr 2026US 2026/0115705 A1Changhua Chemical Technology Co., Ltd.
Most cited
By later US patents
- Phase transfer catalyzed preparation of aromatic polyether polymers113US 5,229,482 AGeneral Electric Company · 1993
- Non-aqueous liquid composition with an ionic character and its use as a solvent55US 5,104,840 AInstitut Francais du Petrole · 1992
- Regeneration of ionic liquid catalyst by hydrogenation using a supported catalyst37US 7,691,771 B2Chevron U.S.A.Inc. · 2010
- Double metal cyanide catalysts and methods for making them36US 5,714,639 AARCO Chemical Technology, L. P. · 1998
- Liquid clathrate compositions34US 6,096,680 AAlbemarle Corporation · 2000