B01D 3/4211
Of columns
Official title: {of columns}
B01D3/4211 (Of columns) appears on 294 US grants and 214 published applications in this corpus.
Search patents in B01D- Granted patents
- 294
- Published applications
- 214
- Assignees
- 141
- Inventors
- 635
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 15 | 0 |
| 1978 | 3 | 0 |
| 1979 | 5 | 0 |
| 1980 | 8 | 0 |
| 1981 | 10 | 0 |
| 1982 | 7 | 0 |
| 1983 | 10 | 0 |
| 1984 | 6 | 0 |
| 1985 | 14 | 0 |
| 1986 | 5 | 0 |
| 1987 | 2 | 0 |
| 1988 | 5 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 6 | 0 |
| 1994 | 6 | 0 |
| 1995 | 5 | 0 |
| 1996 | 4 | 0 |
| 1997 | 3 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 1 |
| 2002 | 2 | 1 |
| 2003 | 4 | 2 |
| 2004 | 2 | 5 |
| 2005 | 1 | 7 |
| 2006 | 0 | 4 |
| 2007 | 5 | 4 |
| 2008 | 2 | 3 |
| 2009 | 4 | 5 |
| 2010 | 2 | 5 |
| 2011 | 4 | 6 |
| 2012 | 4 | 6 |
| 2013 | 5 | 8 |
| 2014 | 3 | 11 |
| 2015 | 9 | 8 |
| 2016 | 6 | 9 |
| 2017 | 4 | 13 |
| 2018 | 8 | 15 |
| 2019 | 24 | 18 |
| 2020 | 16 | 16 |
| 2021 | 14 | 12 |
| 2022 | 10 | 15 |
| 2023 | 12 | 18 |
| 2024 | 5 | 10 |
| 2025 | 10 | 6 |
| 2026 | 6 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- System and method for substantially horizonal rotating reflux distillation apparatus6 Oct 2026US 12,752,217 B2Development Technologies, LLC
- Distillation column minimum flow arrangement14 Jul 2026US 12,678,708 B2Saudi Arabian Oil Company
- Method for controlling a reactive distillation column7 Jul 2026US 12,673,909 B2BASF SE
- Systems and methods for purging an isolation valve with a liquid purge medium23 Jun 2026US 12,663,087 B2TapcoEnpro, LLC
- Chemical distillation system with in situ analytics16 Jun 2026US 12,654,113 B2Astrotech Technologies, Inc.
- Methods for optimization of distillation column for reduction of energy consumption27 Aug 2026US 2026/0249208 A1Sabic Global Technologies B.V.
- Distillation device and distillation method11 Jun 2026US 2026/0158411 A1Taiyo Nippon Sanso Corporation
- Reactive monomer separation device26 Mar 2026US 2026/0084075 A1LG Chem.Ltd.
- Refinery apparatus26 Mar 2026US 2026/0084077 A1LG Chem.Ltd.
- Distillation method12 Mar 2026US 2026/0069998 A1Toyo Engineering Corporation
Most cited
By later US patents
- Control system using an adaptive neural network for target and path optimization for a multivariable, nonlinear process157US 5,640,491 ANeuralware, Inc. · 1997
- Adaptive-predictive control system128US 4,358,822 A1982
- Fractionation method and apparatus109US 4,230,533 APhillips Petroleum Company · 1980
- Control system using an adaptive neural network for target and path optimization for a multivariable, nonlinear process60US 5,477,444 A1995
- Recovery of HF from an alkylation unit acid stream containing acid soluble oil55US 4,199,409 APhillips Petroleum Company · 1980