B01D 71/601
Polyethylenimine
Official title: {Polyethylenimine}
B01D71/601 (Polyethylenimine) appears on 78 US grants and 124 published applications in this corpus.
Search patents in B01D- Granted patents
- 78
- Published applications
- 124
- Assignees
- 102
- Inventors
- 348
- Latest grant
- 21 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 2 |
| 2003 | 0 | 0 |
| 2004 | 1 | 1 |
| 2005 | 1 | 1 |
| 2006 | 2 | 4 |
| 2007 | 2 | 1 |
| 2008 | 2 | 1 |
| 2009 | 0 | 4 |
| 2010 | 0 | 4 |
| 2011 | 2 | 1 |
| 2012 | 1 | 1 |
| 2013 | 1 | 7 |
| 2014 | 0 | 4 |
| 2015 | 4 | 6 |
| 2016 | 2 | 10 |
| 2017 | 4 | 5 |
| 2018 | 5 | 4 |
| 2019 | 8 | 9 |
| 2020 | 5 | 13 |
| 2021 | 7 | 7 |
| 2022 | 8 | 9 |
| 2023 | 6 | 6 |
| 2024 | 3 | 6 |
| 2025 | 3 | 11 |
| 2026 | 1 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Hollow fiber and a process for preparation thereof21 Jul 2026US 12,685,972 B2E. & J. Gallo Winery
- Method for producing a polyelectrolyte complex membrane4 Nov 2025US 12,458,928 B2Dwi—Leibniz-Institut FüR Interaktive Materialien E.V.
- Block polymer composite membranes26 Aug 2025US 12,398,243 B2Purdue Research Foundation
- Gas separation membranes3 Jun 2025US 12,318,736 B2Norwegian University of Science and Technology (Ntnu)
- Gas permeable membranes and methods of using thereof24 Dec 2024US 12,172,136 B2Ohio State Innovation Foundation
- Hollow fiber and a process for preparation thereof10 Sep 2026US 2026/0264024 A1
- Hollow fiber membrane and hollow fiber membrane module6 Aug 2026US 2026/0225044 A1Toray Industries, Inc.
- A plasma processing system with a gas recycling system18 Jun 2026US 2026/0166479 A1Lam Research Corporation
- Filtration apparatus comprising polymer modified graphene oxide membranes18 Jun 2026US 2026/0166496 A1
- Processes for preparing asymmetric hollow fiber membranes, asymmetric hollow fiber membranes and use of asymmetric hollow fiber membranes21 May 2026US 2026/0138094 A1Pam Membranas Seletivas Ltda
Most cited
By later US patents
- Semipermeable composite membrane101US 4,302,336 ATeijin Limited · 1981
- Reverse osmosis membrane83US 4,039,440 AThe United States of America as represented by the Secretary of the Interior · 1977
- Semipermeable membranes and the method for the preparation thereof74US 4,005,012 AThe United States of America as represented by the Secretary of the Interior · 1977
- Semipermeable encapsulated membranes, process for their manufacture and their use66US 4,778,596 AAligena AG · 1988
- Amphoteric ion-permeable composite membrane54US 4,360,434 ATeijin Limited · 1982