B01D 71/441
Polyvinylpyrrolidone
Official title: {Polyvinylpyrrolidone}
B01D71/441 (Polyvinylpyrrolidone) appears on 157 US grants and 222 published applications in this corpus.
Search patents in B01D- Granted patents
- 157
- Published applications
- 222
- Assignees
- 128
- Inventors
- 551
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 1 |
| 2002 | 2 | 1 |
| 2003 | 1 | 1 |
| 2004 | 1 | 1 |
| 2005 | 0 | 2 |
| 2006 | 0 | 4 |
| 2007 | 0 | 4 |
| 2008 | 3 | 5 |
| 2009 | 0 | 4 |
| 2010 | 0 | 6 |
| 2011 | 3 | 11 |
| 2012 | 3 | 9 |
| 2013 | 3 | 4 |
| 2014 | 8 | 7 |
| 2015 | 6 | 10 |
| 2016 | 5 | 3 |
| 2017 | 5 | 10 |
| 2018 | 5 | 13 |
| 2019 | 4 | 18 |
| 2020 | 15 | 19 |
| 2021 | 13 | 20 |
| 2022 | 20 | 23 |
| 2023 | 13 | 12 |
| 2024 | 10 | 15 |
| 2025 | 13 | 8 |
| 2026 | 7 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Device for cutting hollow fiber membranes30 Jun 2026US 12,667,811 B2Gambro Lundia AB
- High flux nanofiltration membrane2 Jun 2026US 12,643,075 B1King Fahd University of Petroleum and Minerals
- Guanidine-containing membranes and methods of using thereof10 Mar 2026US 12,569,802 B2Ohio State Innovation Foundation
- Spinneret17 Feb 2026US 12,551,853 B2Gambro Lundia AB
- Spinning beam17 Feb 2026US 12,553,153 B2Gambro Lundia AB
- Porous membrane and purification method8 Oct 2026US 2026/0307015 A1Toyobo Co., Ltd.
- Hollow fiber membranes comprising a poly(aryl ether sulfone) and a water-soluble polymer additive1 Oct 2026US 2026/0295540 A1BASF SE
- Separation functional layer and separation membrane10 Sep 2026US 2026/0264001 A1Nitto Denko Corporation
- Hollow fiber membrane, method for manufacturing hollow fiber membrane, and hollow fiber membrane module6 Aug 2026US 2026/0225043 A1Toray Industries, Inc.
- On-line drying of hollow fiber membranes30 Jul 2026US 2026/0216658 A1
Most cited
By later US patents
- Preparation of crosslinked matrices containing covalently immobilized chemical species and unbound releasable chemical species253US 5,563,056 ABSI Corporation · 1996
- Porous membranes124US 6,395,325 B1SciMed Life Systems, Inc. · 2002
- N-Vinyl lactam based biomedical devices89US 4,436,887 ABausch & Lomb Incorporated · 1984
- Semipermeable composite membrane87US 4,353,802 ATeijin Limited · 1982
- Macroporous asymmetrical hydrophilic membrane made of a synthetic polymer57US 4,720,343 AHoechst Aktiengesellschaft · 1988