B01D 71/281
Polystyrene
Official title: {Polystyrene}
B01D71/281 (Polystyrene) appears on 182 US grants and 253 published applications in this corpus.
Search patents in B01D- Granted patents
- 182
- Published applications
- 253
- Assignees
- 179
- Inventors
- 653
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 3 | 0 |
| 1991 | 4 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 4 |
| 2003 | 4 | 6 |
| 2004 | 3 | 4 |
| 2005 | 2 | 3 |
| 2006 | 3 | 6 |
| 2007 | 2 | 4 |
| 2008 | 2 | 7 |
| 2009 | 1 | 6 |
| 2010 | 5 | 13 |
| 2011 | 8 | 4 |
| 2012 | 1 | 4 |
| 2013 | 10 | 11 |
| 2014 | 2 | 9 |
| 2015 | 5 | 6 |
| 2016 | 8 | 11 |
| 2017 | 6 | 9 |
| 2018 | 6 | 10 |
| 2019 | 9 | 14 |
| 2020 | 12 | 21 |
| 2021 | 6 | 17 |
| 2022 | 14 | 19 |
| 2023 | 10 | 20 |
| 2024 | 8 | 15 |
| 2025 | 18 | 19 |
| 2026 | 10 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Cross-linkable polymer compositions and applications thereof8 Sep 2026US 12,729,261 B2Notark Corporation
- Cation exchange membrane and method for producing same1 Sep 2026US 12,722,125 B2Astom Corporation
- Gas separation membrane, and preparation method therefor and use thereof25 Aug 2026US 12,714,972 B2Changshu 3F Zhonghao New Chemical Materials Co., Ltd.
- Diffusion transfer functionalized membrane28 Jul 2026US 12,691,420 B2Wisconsin Alumni Research Foundation
- Sulfonated polymers and compositions thereof26 May 2026US 12,637,532 B2Kraton Corporation
- Cationic Compounds for Anion Exchange Membranes3 Sep 2026US 2026/0257990 A1Agfa-Gevaert
- Ceramic nanofiltration membrane with polymers grafted into the pores and method of producing same2 Jul 2026US 2026/0183722 A1Vito NV
- Articles Including an Isoporous Membrane Disposed on a Porous Substrate and Methods of Making the Same11 Jun 2026US 2026/0158450 A1Thermo Fisher Scientific Inc.
- Polyelectrolyte coacervate membranes and methods for the manufacture thereof23 Apr 2026US 2026/0108851 A1University of Massachusetts
- Bituminous waterproofing membrane comprising a recycled bituminous binder, a reinforcement and a rejuvenator16 Apr 2026US 2026/0102743 A1S. A. Imperbel N.V.
Most cited
By later US patents
- Sulfonated block copolymers, method for making same, and various uses for such block copolymers100US 7,737,224 B2KRATON Polymers U. S. LLC · 2010
- Gas separation device92US 6,635,104 B2McMaster University · 2003
- Crosslinked polymer electrolyte membranes for heat and moisture exchange devices86US 6,841,601 B2Dais Analytic Corporation · 2005
- Graft polymeric membranes and ion-exchange membranes formed therefrom82US 6,723,758 B2Ballard Power Systems Inc. · 2004
- Isotropic microporous syndiotactic polystyrene membranes and processes for preparing the same74US 5,015,275 AThe Dow Chemical Company · 1991