B01D 3/20
Bubble caps
Official title: Bubble caps; Risers for vapour; Discharge pipes for liquid
B01D3/20 (Bubble caps) appears on 329 US grants and 210 published applications in this corpus.
Search patents in B01D- Granted patents
- 329
- Published applications
- 210
- Assignees
- 133
- Inventors
- 522
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 4 | 0 |
| 1978 | 2 | 0 |
| 1979 | 4 | 0 |
| 1980 | 5 | 0 |
| 1981 | 1 | 0 |
| 1982 | 3 | 0 |
| 1983 | 1 | 0 |
| 1984 | 7 | 0 |
| 1985 | 4 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 5 | 0 |
| 1990 | 4 | 0 |
| 1991 | 5 | 0 |
| 1992 | 9 | 0 |
| 1993 | 11 | 0 |
| 1994 | 9 | 0 |
| 1995 | 11 | 0 |
| 1996 | 9 | 0 |
| 1997 | 8 | 0 |
| 1998 | 6 | 0 |
| 1999 | 13 | 0 |
| 2000 | 14 | 0 |
| 2001 | 9 | 9 |
| 2002 | 10 | 11 |
| 2003 | 13 | 14 |
| 2004 | 10 | 19 |
| 2005 | 7 | 10 |
| 2006 | 13 | 5 |
| 2007 | 8 | 9 |
| 2008 | 4 | 6 |
| 2009 | 7 | 9 |
| 2010 | 7 | 5 |
| 2011 | 8 | 8 |
| 2012 | 6 | 7 |
| 2013 | 6 | 7 |
| 2014 | 7 | 10 |
| 2015 | 5 | 10 |
| 2016 | 10 | 12 |
| 2017 | 4 | 10 |
| 2018 | 13 | 9 |
| 2019 | 10 | 8 |
| 2020 | 6 | 6 |
| 2021 | 5 | 7 |
| 2022 | 8 | 5 |
| 2023 | 1 | 3 |
| 2024 | 2 | 4 |
| 2025 | 4 | 4 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Multi-stage bubble-column vapor mixture condensation23 Jun 2026US 12,661,605 B2King Fahd University of Petroleum and Minerals
- Separation process and apparatus23 Dec 2025US 12,503,419 B2Ineos Acetyls UK Limited
- Process for the preparation of ethylene glycol25 Nov 2025US 12,479,781 B2Shell USA, Inc.
- Column for thermal treatment of a mixture of compounds having a tendency to polymerization21 Oct 2025US 12,447,417 B2BASF SE
- Process and apparatus for the preparation of alkylene glycol6 May 2025US 12,291,496 B2Shell USA, Inc.
- Thermal desalination system3 Sep 2026US 2026/0257145 A1Research Foundation of the City University of New York
- Vapor-liquid contact tray with cans and swirlers in the cans and method6 Aug 2026US 2026/0224999 A1Koch-Glitsch, LP
- Refinery apparatus26 Mar 2026US 2026/0084077 A1LG Chem.Ltd.
- Apparatuses and methods for improved distillation of sustainable aviation fuel16 Oct 2025US 2025/0320412 A1
- Mass transfer tray, use thereof, column having the same, and thermal separation process12 Jun 2025US 2025/0186902 A1BASF SE
Most cited
By later US patents
- Production of carboxylic acid ester by esterification and apparatus thereof79US 5,536,856 ADavy Process Technology Limited · 1996
- De-entrainment tray and method of operation67US 5,972,171 AMobil Oil Corporation · 1999
- Contact structure for use in catalytic distillation55US 4,439,350 AChemical Research & Licensing Company · 1984
- Downcomer-tray assembly and method54US 4,956,127 AGlitsch, Inc. · 1990
- Outlet means for vapor-liquid contacting tray53US 4,159,291 AUnion Carbide Corporation · 1979