B01D 71/58
Other polymers having nitrogen in the main chain, with or without oxygen
Official title: Other polymers having nitrogen in the main chain, with or without oxygen or carbon only
B01D71/58 (Other polymers having nitrogen in the main chain, with or without oxygen) appears on 1,049 US grants and 1,222 published applications in this corpus.
Search patents in B01D- Granted patents
- 1,049
- Published applications
- 1,222
- Assignees
- 551
- Inventors
- 2,693
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 5 | 0 |
| 1978 | 7 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 6 | 0 |
| 1982 | 6 | 0 |
| 1983 | 8 | 0 |
| 1984 | 7 | 0 |
| 1985 | 9 | 0 |
| 1986 | 6 | 0 |
| 1987 | 9 | 0 |
| 1988 | 7 | 0 |
| 1989 | 14 | 0 |
| 1990 | 23 | 0 |
| 1991 | 30 | 0 |
| 1992 | 13 | 0 |
| 1993 | 16 | 0 |
| 1994 | 11 | 0 |
| 1995 | 10 | 0 |
| 1996 | 7 | 0 |
| 1997 | 13 | 0 |
| 1998 | 22 | 0 |
| 1999 | 12 | 0 |
| 2000 | 2 | 0 |
| 2001 | 5 | 1 |
| 2002 | 9 | 17 |
| 2003 | 14 | 15 |
| 2004 | 9 | 17 |
| 2005 | 7 | 22 |
| 2006 | 11 | 30 |
| 2007 | 12 | 17 |
| 2008 | 10 | 26 |
| 2009 | 14 | 23 |
| 2010 | 30 | 47 |
| 2011 | 14 | 40 |
| 2012 | 31 | 40 |
| 2013 | 29 | 38 |
| 2014 | 29 | 58 |
| 2015 | 44 | 87 |
| 2016 | 54 | 86 |
| 2017 | 57 | 58 |
| 2018 | 53 | 70 |
| 2019 | 52 | 70 |
| 2020 | 46 | 71 |
| 2021 | 61 | 68 |
| 2022 | 37 | 64 |
| 2023 | 44 | 63 |
| 2024 | 52 | 75 |
| 2025 | 44 | 63 |
| 2026 | 29 | 56 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Composite semipermeable membrane, spiral membrane element, water treatment system, and water treatment method18 Aug 2026US 12,708,880 B2Nitto Denko Corporation
- Method for the separation of phosphorus pentafluoride from hydrogen chloride11 Aug 2026US 12,702,948 B2Mexichem Fluor S.A. De C.V.
- Laminate11 Aug 2026US 12,703,777 B2Daicel Corporation
- Method for preparing a novel guanidine-based composite nanofiltration flat-sheet membrane21 Jul 2026US 12,685,969 B2Tongji University
- Hollow fiber and a process for preparation thereof21 Jul 2026US 12,685,972 B2E. & J. Gallo Winery
- Conductive forward osmosis membrane and preparation method thereof8 Oct 2026US 2026/0307018 A1Beijing Baoshengtong International Electrical Engineering Technology Co., Ltd.
- Conductive base membrane and preparation method thereof24 Sep 2026US 2026/0284606 A1Beijing Baoshengtong International Electrical Engineering Technology Co., Ltd.
- Separation membrane and method for producing same17 Sep 2026US 2026/0273476 A1Hiroshima University
- Acid-resistant and alkali-resistant composite nanofiltration membrane, and preparation method therefor and use thereof17 Sep 2026US 2026/0273478 A1China Petroleum & Chemical Corporation
- Separation membrane17 Sep 2026US 2026/0273479 A1Nitto Denko Corporation
Most cited
By later US patents
- Porous microfabricated polymer membrane structures460US 5,807,406 ABaxter International Inc. · 1998
- Systems for premeating molecules of predetermined molecular weight range361US 5,756,632 AThe Polymer Technology Group · 1998
- Composite solid polymer electrolyte membranes346US 7,550,216 B2Foster-Miller, Inc. · 2009
- Copolymers and non-porous, semi-permeable membrane thereof and its use for permeating molecules of predetermined molecular weight range303US 5,428,123 AThe Polymer Technology Group · 1995
- Proton conducting polymers used as membranes200US 5,525,436 ACase Western Reserve University · 1996