B01D 71/421
Polyacrylonitrile
Official title: {Polyacrylonitrile}
B01D71/421 (Polyacrylonitrile) appears on 167 US grants and 180 published applications in this corpus.
Search patents in B01D- Granted patents
- 167
- Published applications
- 180
- Assignees
- 145
- Inventors
- 621
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 3 | 0 |
| 1981 | 5 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 7 | 0 |
| 1992 | 4 | 0 |
| 1993 | 5 | 0 |
| 1994 | 3 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 1 |
| 2002 | 2 | 0 |
| 2003 | 0 | 4 |
| 2004 | 0 | 2 |
| 2005 | 1 | 1 |
| 2006 | 2 | 3 |
| 2007 | 1 | 2 |
| 2008 | 1 | 1 |
| 2009 | 1 | 5 |
| 2010 | 1 | 1 |
| 2011 | 0 | 3 |
| 2012 | 0 | 7 |
| 2013 | 5 | 5 |
| 2014 | 1 | 6 |
| 2015 | 4 | 16 |
| 2016 | 7 | 17 |
| 2017 | 5 | 9 |
| 2018 | 16 | 11 |
| 2019 | 7 | 16 |
| 2020 | 10 | 20 |
| 2021 | 10 | 15 |
| 2022 | 15 | 9 |
| 2023 | 11 | 11 |
| 2024 | 4 | 6 |
| 2025 | 5 | 4 |
| 2026 | 2 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- 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
- Cell concentration methods and devices for use in automated bioreactors21 Apr 2026US 12,606,792 B2Lonza Walkersville, Inc.
- Gas separation membrane and gas separation membrane module25 Nov 2025US 12,478,926 B2Toray Industries, Inc.
- Polymer-based film, preparation method therefor, and use thereof14 Oct 2025US 12,440,808 B2Beijing Research Institute of Chemical Industry, China Petroleum & Chemical Corporation
- Efficient and stable magnetic nanofiber membrane and preparation method and use thereof30 Sep 2025US 12,427,485 B2Beijing Normal University, Zhuhai
- Hollow fiber membrane and hollow fiber membrane module6 Aug 2026US 2026/0225044 A1Toray Industries, Inc.
- Membrane-based dehumidification system, thermally-insulative selective membrane, and method4 Jun 2026US 2026/0151729 A1Purdue Research Foundation
- Raw Material Solution Concentration System30 Apr 2026US 2026/0115663 A1Asahi Kasei Kabushiki Kaisha
- Necklace-shaped nanofiber hybrid membrane for simultaneous removal of particulate matter and sulfides and method for preparing the same26 Mar 2026US 2026/0084118 A1Gwangju Institute of Science and Technology
- Dual-fiber ion-exchange membranes12 Mar 2026US 2026/0070047 A1Uchicago Argonne, LLC
Most cited
By later US patents
- Multicomponent membranes for gas separations355US 4,230,463 AMonsanto Company · 1980
- Filter medium having a limited surface negative charge for treating a blood material109US 5,407,581 AAsahi Medical Co., Ltd. · 1995
- Rotary filtration device with hyperphilic membrane88US 5,000,848 AMembrex, Inc. · 1991
- Ion-exchange membranes reinforced with non-woven carbon fibers69US 4,505,797 AIonics, Incorporated · 1985
- Coated membranes53US 5,028,337 AAligena AG · 1991