B01D 71/18
Mixed esters
Official title: Mixed esters, e.g. cellulose acetate-butyrate
B01D71/18 (Mixed esters) appears on 29 US grants and 27 published applications in this corpus.
Search patents in B01D- Granted patents
- 29
- Published applications
- 27
- Assignees
- 19
- Inventors
- 54
- Latest grant
- 3 Jun 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 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 | 3 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 1 | 1 |
| 2009 | 1 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 3 |
| 2013 | 1 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
| 2018 | 0 | 4 |
| 2019 | 0 | 2 |
| 2020 | 1 | 7 |
| 2021 | 5 | 1 |
| 2022 | 2 | 2 |
| 2023 | 2 | 2 |
| 2024 | 1 | 0 |
| 2025 | 1 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Mechanically stable ultrafiltration membrane, and method for producing same3 Jun 2025US 12,318,734 B2Sartorius Stedim Biotech GmbH
- High free volume membrane for gas separation5 Nov 2024US 12,134,068 B2Saudi Arabian Oil Company
- High free volume membrane for gas separation8 Aug 2023US 11,717,787 B2Saudi Arabian Oil Company
- Cellulose ester and molded article thereof9 May 2023US 11,643,476 B2Daicel Corporation
- Separating membrane and method for manufacturing separating membrane20 Sep 2022US 11,446,611 B2Toray Industries, Inc.
- Mechanically stable ultrafiltration membrane, and method for producing same28 May 2026US 2026/0145140 A1Sartorius Stedim Biotech GmbH
- High free volume membrane for gas separation7 Sep 2023US 2023/0277980 A1Saudi Arabian Oil Company
- Method for preparing peptide emulsion formulation23 Feb 2023US 2023/0055555 A1Sumitomo Pharma Co., Ltd.
- Mechanically stable ultrafiltration membrane, and method for producing same29 Dec 2022US 2022/0410081 A1Sartorius Stedim Biotech GmbH
- High free volume membrane for gas separation7 Jul 2022US 2022/0212139 A1Saudi Arabian Oil Company
Most cited
By later US patents
- Modified chitin for biocompatible dialysis membranes II and process for preparation of modified cellulose and modified chitin for use therewith33US 5,093,486 AAkzo N. V. · 1992
- Asymmetric forward osmosis membranes31US 7,445,712 B2Hydration Technologies Inc. · 2008
- Semipermeable membranes from modified polymers26US 4,305,823 ACiba-Geigy Corporation · 1981
- Modified cellulose for biocompatible dialysis membranes II and process for preparation thereof20US 4,981,959 AAkzo N. V. · 1991
- Micro-porous sheet14US 4,171,987 AFuji Photo Film Co., Ltd. · 1979