B01D 3/4216
Head stream
Official title: {Head stream}
B01D3/4216 (Head stream) appears on 24 US grants and 24 published applications in this corpus.
Search patents in B01D- Granted patents
- 24
- Published applications
- 24
- Assignees
- 15
- Inventors
- 62
- Latest grant
- 25 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 1 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 2 |
| 2012 | 0 | 1 |
| 2013 | 1 | 0 |
| 2014 | 1 | 5 |
| 2015 | 0 | 0 |
| 2016 | 1 | 0 |
| 2017 | 0 | 1 |
| 2018 | 1 | 0 |
| 2019 | 1 | 1 |
| 2020 | 3 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 8 |
| 2024 | 0 | 2 |
| 2025 | 4 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for producing 1,3-butylene glycol, and 1,3-butylene glycol product25 Nov 2025US 12,478,568 B2Daicel Corporation
- Method for producing 1,3-butylene glycol, and 1,3-butylene glycol product18 Nov 2025US 12,472,133 B2Daicel Corporation
- Method for manufacturing 1,3-butylene glycol, and 1,3-butylene glycol product18 Nov 2025US 12,472,134 B2Daicel Corporation
- Reflux arrangement for distillation columns11 Mar 2025US 12,247,007 B2Saudi Arabian Oil Company
- Purification of mercaptans or thiophenes using dividing wall column distillation20 Oct 2020US 10,807,949 B2Arkema Inc.
- Methods for optimization of distillation column for reduction of energy consumption27 Aug 2026US 2026/0249208 A1Sabic Global Technologies B.V.
- Fractional distillation system and method23 May 2024US 2024/0165535 A1Entegris, Inc.
- Reflux arrangement for distillation columns29 Feb 2024US 2024/0067590 A1Saudi Arabian Oil Company
- 1,3-butylene glycol product26 Oct 2023US 2023/0338248 A1Daicel Corporation
- 1,3-butylene glycol product and method for producing 1,3-butylene glycol30 Mar 2023US 2023/0098112 A1Daicel Corporation
Most cited
By later US patents
- On-line acid monitor and neutralizer feed control of the overhead water in oil refineries26US 5,302,253 ANalco Chemical Company · 1994
- On-line acid monitor and neutralizer feed control of the overhead water in oil refineries26US 5,326,482 ANalco Chemical Company · 1994
- Distillation apparatus for readily polymerizable compound9US 7,288,169 B2Mitsubishi Chemical Corporation · 2007
- Separation of distillation products using color sensing5US 10,758,839 B1Illuminated Extractors, Ltd. · 2020
- Method for controlling heat input to the reboiler section of a distillation column5US 4,046,638 AUop LLC · 1977