B01D 69/1216
Three or more layers
Official title: {Three or more layers}
B01D69/1216 (Three or more layers) appears on 513 US grants and 743 published applications in this corpus.
Search patents in B01D- Granted patents
- 513
- Published applications
- 743
- Assignees
- 400
- Inventors
- 1,855
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 4 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 4 | 0 |
| 1988 | 1 | 0 |
| 1989 | 6 | 0 |
| 1990 | 4 | 0 |
| 1991 | 4 | 0 |
| 1992 | 4 | 0 |
| 1993 | 5 | 0 |
| 1994 | 3 | 0 |
| 1995 | 6 | 0 |
| 1996 | 3 | 0 |
| 1997 | 7 | 0 |
| 1998 | 6 | 0 |
| 1999 | 3 | 0 |
| 2000 | 6 | 0 |
| 2001 | 4 | 2 |
| 2002 | 5 | 17 |
| 2003 | 8 | 13 |
| 2004 | 6 | 17 |
| 2005 | 9 | 14 |
| 2006 | 12 | 9 |
| 2007 | 11 | 17 |
| 2008 | 4 | 12 |
| 2009 | 8 | 22 |
| 2010 | 8 | 17 |
| 2011 | 15 | 17 |
| 2012 | 11 | 23 |
| 2013 | 11 | 25 |
| 2014 | 16 | 31 |
| 2015 | 11 | 39 |
| 2016 | 20 | 35 |
| 2017 | 28 | 41 |
| 2018 | 30 | 56 |
| 2019 | 36 | 47 |
| 2020 | 37 | 60 |
| 2021 | 37 | 34 |
| 2022 | 30 | 40 |
| 2023 | 22 | 37 |
| 2024 | 21 | 43 |
| 2025 | 23 | 37 |
| 2026 | 18 | 38 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Membrane assembly for gas separation, method for producing the membrane assembly and method of separating gases15 Sep 2026US 12,734,487 B2Université De Fribourg
- Palladium-based membrane25 Aug 2026US 12,715,767 B2National University of Singapore
- Composite semipermeable membrane, spiral membrane element, water treatment system, and water treatment method18 Aug 2026US 12,708,880 B2Nitto Denko Corporation
- Hollow fiber membrane and method for producing same28 Jul 2026US 12,691,415 B2Kolon Industries, Inc.
- Composite separator for gas separation21 Jul 2026US 12,685,963 B2SK ie technology Co., Ltd.
- Conductive forward osmosis membrane and preparation method thereof8 Oct 2026US 2026/0307018 A1Beijing Baoshengtong International Electrical Engineering Technology Co., Ltd.
- Composite separator for gas separation24 Sep 2026US 2026/0284586 A1SK ie technology Co., Ltd.
- Conductive base membrane and preparation method thereof24 Sep 2026US 2026/0284606 A1Beijing Baoshengtong International Electrical Engineering Technology Co., Ltd.
- Polyamide-based mixed matrix membrane for oil-water separation24 Sep 2026US 2026/0286076 A1King Fahd University of Petroleum and Minerals
- Acid-resistant and alkali-resistant composite nanofiltration membrane, and preparation method therefor and use thereof17 Sep 2026US 2026/0273478 A1China Petroleum & Chemical Corporation
Most cited
By later US patents
- Porous microfabricated polymer membrane structures460US 5,807,406 ABaxter International Inc. · 1998
- Hydrogen gas-extraction module and method of fabrication341US 6,152,987 AWorcester Polytechnic Institute · 2000
- Filtration membranes, and related nano and/or micro fibers, composites, methods and systems254US 10,532,330 B2California Institute of Technology · 2020
- Composite hydrogen separation element and module185US 5,498,278 ABend Research, Inc. · 1996
- Composite metal membrane175US 5,738,708 AThe Regents of the University of California Office of Technology Transfer · 1998