B01D 71/56
Polyamides
Official title: Polyamides, e.g. polyester-amides
B01D71/56 (Polyamides) appears on 830 US grants and 1,083 published applications in this corpus.
Search patents in B01D- Granted patents
- 830
- Published applications
- 1,083
- Assignees
- 433
- Inventors
- 2,348
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 3 | 0 |
| 1978 | 4 | 0 |
| 1979 | 1 | 0 |
| 1980 | 7 | 0 |
| 1981 | 4 | 0 |
| 1982 | 4 | 0 |
| 1983 | 4 | 0 |
| 1984 | 9 | 0 |
| 1985 | 6 | 0 |
| 1986 | 12 | 0 |
| 1987 | 12 | 0 |
| 1988 | 17 | 0 |
| 1989 | 15 | 0 |
| 1990 | 10 | 0 |
| 1991 | 15 | 0 |
| 1992 | 14 | 0 |
| 1993 | 9 | 0 |
| 1994 | 7 | 0 |
| 1995 | 4 | 0 |
| 1996 | 8 | 0 |
| 1997 | 5 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 6 | 0 |
| 2001 | 6 | 2 |
| 2002 | 7 | 13 |
| 2003 | 7 | 15 |
| 2004 | 11 | 15 |
| 2005 | 6 | 16 |
| 2006 | 6 | 12 |
| 2007 | 7 | 13 |
| 2008 | 6 | 21 |
| 2009 | 10 | 11 |
| 2010 | 13 | 22 |
| 2011 | 9 | 28 |
| 2012 | 10 | 39 |
| 2013 | 14 | 45 |
| 2014 | 31 | 53 |
| 2015 | 29 | 73 |
| 2016 | 31 | 62 |
| 2017 | 47 | 69 |
| 2018 | 37 | 55 |
| 2019 | 44 | 67 |
| 2020 | 48 | 79 |
| 2021 | 50 | 70 |
| 2022 | 42 | 59 |
| 2023 | 41 | 69 |
| 2024 | 50 | 83 |
| 2025 | 45 | 60 |
| 2026 | 36 | 32 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Feedstock solution flow concentration system29 Sep 2026US 12,746,511 B2Asahi Kasei Kabushiki Kaisha
- Point of use or point of dispense filter with multiple pleat packs15 Sep 2026US 12,734,488 B2Entegris, Inc.
- Method of preparing reverse osmosis membrane with charged hydrogel and polyamide double network8 Sep 2026US 12,728,388 B2
- Membranes with controlled porosity for serial filtration8 Sep 2026US 12,728,389 B2Gradiant Corporation
- Composite semipermeable membrane, spiral membrane element, water treatment system, and water treatment method18 Aug 2026US 12,708,880 B2Nitto Denko Corporation
- Conductive forward osmosis membrane and preparation method thereof8 Oct 2026US 2026/0307018 A1Beijing Baoshengtong International Electrical Engineering Technology Co., Ltd.
- Contorted polyamide membranes and methods of use thereof8 Oct 2026US 2026/0307019 A1University of Houston System
- Method for producing bioethanol and device for producing bioethanol8 Oct 2026US 2026/0308643 A1ARKHE Co., Ltd.
- Polyamide-based mixed matrix membrane for oil-water separation24 Sep 2026US 2026/0286076 A1King Fahd University of Petroleum and Minerals
- Raw Material Liquid Flow Concentration System and Raw Material Liquid Flow Concentration Method17 Sep 2026US 2026/0273469 A1Asahi Kasei Kabushiki Kaisha
Most cited
By later US patents
- Composite solid polymer electrolyte membranes346US 7,550,216 B2Foster-Miller, Inc. · 2009
- Interfacially synthesized reverse osmosis membrane312US 4,277,344 AFilmtec Corporation · 1981
- Process for preparing hydrophilic polyamide membrane filter media and product277US 4,340,479 APall Corporation · 1982
- Composite solid polymer electrolyte membranes158US 6,248,469 B1Foster-Miller, Inc. · 2001
- Semipermeable thin-film membranes comprising siloxane, alkoxysilyl and aryloxysilyl oligomers and copolymers146US 4,781,733 ABend Research, Inc. · 1988