B01D 9/004
Fractional crystallisation
Official title: {Fractional crystallisation; Fractionating or rectifying columns}
B01D9/004 (Fractional crystallisation) appears on 239 US grants and 214 published applications in this corpus.
Search patents in B01D- Granted patents
- 239
- Published applications
- 214
- Assignees
- 189
- Inventors
- 649
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 3 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 6 | 0 |
| 1983 | 2 | 0 |
| 1984 | 5 | 0 |
| 1985 | 5 | 0 |
| 1986 | 6 | 0 |
| 1987 | 5 | 0 |
| 1988 | 6 | 0 |
| 1989 | 6 | 0 |
| 1990 | 4 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 3 | 0 |
| 1995 | 8 | 0 |
| 1996 | 6 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 3 | 0 |
| 2001 | 3 | 0 |
| 2002 | 3 | 1 |
| 2003 | 2 | 3 |
| 2004 | 1 | 2 |
| 2005 | 0 | 4 |
| 2006 | 1 | 4 |
| 2007 | 2 | 2 |
| 2008 | 3 | 6 |
| 2009 | 3 | 10 |
| 2010 | 3 | 11 |
| 2011 | 5 | 8 |
| 2012 | 10 | 9 |
| 2013 | 7 | 4 |
| 2014 | 7 | 4 |
| 2015 | 3 | 5 |
| 2016 | 2 | 7 |
| 2017 | 4 | 2 |
| 2018 | 6 | 11 |
| 2019 | 9 | 11 |
| 2020 | 17 | 17 |
| 2021 | 10 | 15 |
| 2022 | 10 | 19 |
| 2023 | 10 | 11 |
| 2024 | 12 | 25 |
| 2025 | 7 | 12 |
| 2026 | 10 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for purifying compound8 Sep 2026US 12,729,176 B2Nippon Shokubai Co., Ltd.
- Cannabidiol-dominant formulations, methods of manufacturing, and uses thereof18 Aug 2026US 12,708,633 B2Tilray Brands, Inc.
- Purification device18 Aug 2026US 12,709,593 B2Nippon Shokubai Co., Ltd.
- Lithium carbonate production process and apparatus30 Jun 2026US 12,668,497 B2U. S. Borax Inc.
- Method for producing compound21 Apr 2026US 12,606,515 B2Nippon Shokubai Co., Ltd.
- A method and plant for purifying ethylene carbonate8 Oct 2026US 2026/0308138 A1Sulzer Management AG
- Process for making drug crystals of desired size distribution and morphology20 Aug 2026US 2026/0241307 A1Eupraxia Pharmaceuticals Inc.
- Zeolitic adsorbent for high productivity xylene separation30 Jul 2026US 2026/0216691 A1
- Method for discharging crystal grain-containing slurry from container23 Jul 2026US 2026/0208068 A1Nippon Shokubai Co., Ltd.
- Continuous process for crystallizing bis (2-hydroxyethyl) terephthalate and crystallizer used therein23 Jul 2026US 2026/0209162 A1Chempet Srl
Most cited
By later US patents
- Method for determining the compositional distribution of a crystalline copolymer191US 5,008,204 AExxon Chemical Patents Inc. · 1991
- Process for continuous crystallization46US 4,332,592 A1982
- Method and apparatus for purifying acrylic acid, and acrylic acid purified by the method43US 5,504,247 ASulzer Chemtech AG · 1996
- Hydrocyclone for washing particles in liquid suspension27US 4,960,525 AThe United States of America as represented by the Secretary of Agriculture · 1990
- Countercurrent, cooling crystallization and purification method for multi-component molten mixture26US 4,588,414 AMitsubishi Gas Chemical Company, Inc. · 1986