B01D 71/381
Polyvinylalcohol
Official title: {Polyvinylalcohol}
B01D71/381 (Polyvinylalcohol) appears on 234 US grants and 252 published applications in this corpus.
Search patents in B01D- Granted patents
- 234
- Published applications
- 252
- Assignees
- 172
- Inventors
- 735
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 6 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 3 | 0 |
| 1989 | 5 | 0 |
| 1990 | 9 | 0 |
| 1991 | 6 | 0 |
| 1992 | 6 | 0 |
| 1993 | 2 | 0 |
| 1994 | 3 | 0 |
| 1995 | 4 | 0 |
| 1996 | 3 | 0 |
| 1997 | 4 | 0 |
| 1998 | 5 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 2 |
| 2003 | 2 | 0 |
| 2004 | 2 | 3 |
| 2005 | 1 | 8 |
| 2006 | 1 | 5 |
| 2007 | 2 | 5 |
| 2008 | 4 | 7 |
| 2009 | 4 | 4 |
| 2010 | 4 | 5 |
| 2011 | 4 | 6 |
| 2012 | 2 | 6 |
| 2013 | 5 | 12 |
| 2014 | 4 | 8 |
| 2015 | 5 | 23 |
| 2016 | 10 | 18 |
| 2017 | 10 | 17 |
| 2018 | 17 | 11 |
| 2019 | 16 | 21 |
| 2020 | 17 | 19 |
| 2021 | 10 | 12 |
| 2022 | 11 | 18 |
| 2023 | 7 | 13 |
| 2024 | 10 | 10 |
| 2025 | 9 | 12 |
| 2026 | 2 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Composite semipermeable membrane, spiral membrane element, water treatment system, and water treatment method18 Aug 2026US 12,708,880 B2Nitto Denko Corporation
- Crosslinked facilitated transport membrane for hydrogen purification from coal-derived syngas31 Mar 2026US 12,589,363 B2Ohio State Innovation Foundation
- CO2 utilization for co production via fuel cell enabled by CO2-selective membrane21 Oct 2025US 12,447,436 B2Ohio State Innovation Foundation
- Porous separation membrane21 Oct 2025US 12,447,445 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
- Water filtration assembly having a polymer hydrogel filtration media structure24 Sep 2026US 2026/0284604 A1Haier US Appliance Solutions, Inc.
- Separation functional layer and separation membrane10 Sep 2026US 2026/0264001 A1Nitto Denko Corporation
- Purification process of ethyl formate27 Aug 2026US 2026/0249251 A1Taicang Hushi Reagent Co., Ltd.
- Organic solvent regenerator, substrate processing system, and method of regenerating organic solvent27 Aug 2026US 2026/0250222 A1SCREEN Holdings Co., Ltd.
- Composite semipermeable membrane, composite semipermeable membrane module, fluid separation device, and method for producing composite semipermeable membrane6 Aug 2026US 2026/0225045 A1Toray Industries, Inc.
Most cited
By later US patents
- Systems for premeating molecules of predetermined molecular weight range361US 5,756,632 AThe Polymer Technology Group · 1998
- 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
- Biodegradable polymeric compositions based on starch and thermoplastic polymers138US 5,412,005 ANovamont S. p. A. · 1995
- Articles having a polymeric shell and method for preparing same111US 5,443,727 AMinnesota Mining and Manufacturing Company · 1995
- Filter medium having a limited surface negative charge for treating a blood material109US 5,407,581 AAsahi Medical Co., Ltd. · 1995