B01D 71/62
Polycondensates having nitrogen-containing heterocyclic rings in the main chain
B01D71/62 (Polycondensates having nitrogen-containing heterocyclic rings in the main chain) appears on 856 US grants and 931 published applications in this corpus.
Search patents in B01D- Granted patents
- 856
- Published applications
- 931
- Assignees
- 413
- Inventors
- 2,003
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 5 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 5 | 0 |
| 1984 | 7 | 0 |
| 1985 | 6 | 0 |
| 1986 | 5 | 0 |
| 1987 | 7 | 0 |
| 1988 | 5 | 0 |
| 1989 | 12 | 0 |
| 1990 | 23 | 0 |
| 1991 | 29 | 0 |
| 1992 | 12 | 0 |
| 1993 | 15 | 0 |
| 1994 | 11 | 0 |
| 1995 | 9 | 0 |
| 1996 | 7 | 0 |
| 1997 | 13 | 0 |
| 1998 | 20 | 0 |
| 1999 | 12 | 0 |
| 2000 | 1 | 0 |
| 2001 | 5 | 1 |
| 2002 | 9 | 14 |
| 2003 | 14 | 15 |
| 2004 | 8 | 16 |
| 2005 | 5 | 18 |
| 2006 | 9 | 27 |
| 2007 | 9 | 14 |
| 2008 | 9 | 25 |
| 2009 | 13 | 17 |
| 2010 | 28 | 40 |
| 2011 | 11 | 37 |
| 2012 | 28 | 32 |
| 2013 | 25 | 27 |
| 2014 | 26 | 39 |
| 2015 | 34 | 69 |
| 2016 | 44 | 68 |
| 2017 | 47 | 47 |
| 2018 | 44 | 55 |
| 2019 | 40 | 56 |
| 2020 | 37 | 47 |
| 2021 | 42 | 49 |
| 2022 | 25 | 42 |
| 2023 | 31 | 49 |
| 2024 | 41 | 52 |
| 2025 | 31 | 40 |
| 2026 | 22 | 35 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for the separation of phosphorus pentafluoride from hydrogen chloride11 Aug 2026US 12,702,948 B2Mexichem Fluor S.A. De C.V.
- Hollow fiber and a process for preparation thereof21 Jul 2026US 12,685,972 B2E. & J. Gallo Winery
- Fluid separation membranes and use thereof7 Jul 2026US 12,673,298 B1Semicom Dwc-LLC
- Method of creating greater adhesion between asymmetric PVDF active layer and PEI fiber support to obtain multilayer janus membrane30 Jun 2026US 12,667,812 B1King Fahd University of Petroleum and Minerals
- Copoly(1,2,4-triazole)s membranes for sour mixed-gas separation applications30 Jun 2026US 12,668,659 B2Saudi Arabian Oil Company
- Conductive forward osmosis membrane and preparation method thereof8 Oct 2026US 2026/0307018 A1Beijing Baoshengtong International Electrical Engineering Technology Co., Ltd.
- Separation membrane and method for producing same17 Sep 2026US 2026/0273476 A1Hiroshima University
- Separation membrane17 Sep 2026US 2026/0273479 A1Nitto Denko Corporation
- Hollow fiber and a process for preparation thereof10 Sep 2026US 2026/0264024 A1
- Dual-layer hollow fibre membrane27 Aug 2026US 2026/0249249 A1Divigas Pet Ltd
Most cited
By later US patents
- Porous microfabricated polymer membrane structures460US 5,807,406 ABaxter International Inc. · 1998
- Composite solid polymer electrolyte membranes346US 7,550,216 B2Foster-Miller, Inc. · 2009
- Proton conducting polymers used as membranes200US 5,525,436 ACase Western Reserve University · 1996
- Composite solid polymer electrolyte membranes158US 6,248,469 B1Foster-Miller, Inc. · 2001
- Method of making a product with a micro or nano sized structure and product158US 7,531,120 B2Aquamarijn Holding B.V. · 2009