B01D 71/40
Polymers of unsaturated acids or derivatives thereof
Official title: Polymers of unsaturated acids or derivatives thereof, e.g. salts, amides, imides, nitriles, anhydrides, esters
B01D71/40 (Polymers of unsaturated acids or derivatives thereof) appears on 547 US grants and 633 published applications in this corpus.
Search patents in B01D- Granted patents
- 547
- Published applications
- 633
- Assignees
- 387
- Inventors
- 1,776
- Latest grant
- 21 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 3 | 0 |
| 1978 | 6 | 0 |
| 1979 | 5 | 0 |
| 1980 | 3 | 0 |
| 1981 | 11 | 0 |
| 1982 | 4 | 0 |
| 1983 | 7 | 0 |
| 1984 | 5 | 0 |
| 1985 | 6 | 0 |
| 1986 | 2 | 0 |
| 1987 | 10 | 0 |
| 1988 | 3 | 0 |
| 1989 | 14 | 0 |
| 1990 | 14 | 0 |
| 1991 | 14 | 0 |
| 1992 | 8 | 0 |
| 1993 | 7 | 0 |
| 1994 | 7 | 0 |
| 1995 | 2 | 0 |
| 1996 | 5 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 6 | 0 |
| 2001 | 2 | 1 |
| 2002 | 5 | 5 |
| 2003 | 4 | 9 |
| 2004 | 6 | 13 |
| 2005 | 6 | 16 |
| 2006 | 6 | 18 |
| 2007 | 5 | 14 |
| 2008 | 9 | 13 |
| 2009 | 8 | 19 |
| 2010 | 8 | 14 |
| 2011 | 13 | 14 |
| 2012 | 13 | 15 |
| 2013 | 14 | 18 |
| 2014 | 8 | 20 |
| 2015 | 12 | 33 |
| 2016 | 17 | 43 |
| 2017 | 22 | 31 |
| 2018 | 36 | 36 |
| 2019 | 27 | 50 |
| 2020 | 30 | 47 |
| 2021 | 37 | 52 |
| 2022 | 25 | 35 |
| 2023 | 31 | 34 |
| 2024 | 20 | 32 |
| 2025 | 23 | 31 |
| 2026 | 9 | 20 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- B01D 71/401Polymers based on the polymerisation of acrylic acid294
- B01D 71/42Polymers of nitriles187
- B01D 71/403Polymers based on the polymerisation of maleic acid or derivatives thereof37
- B01D 71/404Polymers based on the polymerisation of crotonic acid12
- B01D 71/402Polymers based on the polymerisation of fumaric acid or derivatives thereof9
Recent patents
- Hollow fiber and a process for preparation thereof21 Jul 2026US 12,685,972 B2E. & J. Gallo Winery
- 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
- Laminate12 May 2026US 12,623,444 B2Daicel Corporation
- Cross-linkable zwitterionic polymers and their use in membrane filters21 Apr 2026US 12,605,680 B2Trustees of Tufts College
- Cell concentration methods and devices for use in automated bioreactors21 Apr 2026US 12,606,792 B2Lonza Walkersville, Inc.
- Conductive forward osmosis membrane and preparation method thereof8 Oct 2026US 2026/0307018 A1Beijing Baoshengtong International Electrical Engineering Technology Co., Ltd.
- Hollow fiber and a process for preparation thereof10 Sep 2026US 2026/0264024 A1
- Method for purifying 1,1,1,2,3,3-hexafluoropropane27 Aug 2026US 2026/0250221 A1Arkema France
- Hollow fiber membrane, method for manufacturing hollow fiber membrane, and hollow fiber membrane module6 Aug 2026US 2026/0225043 A1Toray Industries, Inc.
- Hollow fiber membrane and hollow fiber membrane module6 Aug 2026US 2026/0225044 A1Toray Industries, Inc.
Most cited
By later US patents
- Acrylic copolymer membranes for biosensors653US 5,284,140 AEli Lilly and Company · 1994
- Multicomponent membranes for gas separations355US 4,230,463 AMonsanto Company · 1980
- Biocompatible polymer membranes and methods of preparation of three dimensional membrane structures297US 5,514,378 AChildren's Medical Center Corporation · 1996
- Preparation of crosslinked matrices containing covalently immobilized chemical species and unbound releasable chemical species253US 5,563,056 ABSI Corporation · 1996
- Process for the manufacture of an ophthalmic molding244US 6,039,913 ANovartis AG · 2000