B01D 71/20
Esters of inorganic acids
Official title: Esters of inorganic acids, e.g. cellulose nitrate
B01D71/20 (Esters of inorganic acids) appears on 28 US grants and 27 published applications in this corpus.
Search patents in B01D- Granted patents
- 28
- Published applications
- 27
- Assignees
- 28
- Inventors
- 104
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 1 |
| 2004 | 1 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 1 | 0 |
| 2009 | 0 | 0 |
| 2010 | 1 | 3 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 0 | 0 |
| 2015 | 2 | 4 |
| 2016 | 1 | 1 |
| 2017 | 1 | 1 |
| 2018 | 0 | 2 |
| 2019 | 3 | 0 |
| 2020 | 1 | 3 |
| 2021 | 0 | 1 |
| 2022 | 1 | 2 |
| 2023 | 1 | 1 |
| 2024 | 0 | 3 |
| 2025 | 0 | 2 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Filtration membrane and method of production thereof28 Jul 2026US 12,691,422 B2NewSouth Innovations Pty Limited
- Intercalated thin films and methods for their preparation and use30 Jun 2026US 12,668,503 B2University of Washington
- Nitrocellulose membrane comprising non-covalently attached organic nanostructured molecule24 Oct 2023US 11,795,304 B2NB Postech
- Method for separating microplastics from animal excrement14 Jun 2022US 11,360,006 B2Nanjing University
- Polymeric membranes22 Dec 2020US 10,870,086 B2Global Life Sciences Solutions Germany GmbH
- Sorbent membranes with conductive layer for efficient sorbent regeneration3 Apr 2025US 2025/0108327 A1Battelle Memorial Institute
- Membrane for microbiological analysis9 Jan 2025US 2025/0011829 A1Sartorius Stedim Biotech GmbH
- Intercalated thin films and methods for their preparation and use7 Nov 2024US 2024/0367995 A1University of Washington
- Ultra-thin film of thermosetting resin10 Oct 2024US 2024/0337026 A1The University of Tokyo
- Nitrocellulose membrane comprising non-covalently attached organic nanostructured molecule29 Feb 2024US 2024/0067805 A1NB Postech
Most cited
By later US patents
- Leukocyte removal method using a nitrocellulose membrane filter unit31US 5,707,526 A1998
- Process for the separation of olefins from paraffins using membranes19US 7,361,800 B2Monteco Ltd. · 2008
- Cellulosic-liquid composite materials and process of preparing such materials17US 4,029,726 AMoleculon Research Corporation · 1977
- Liquid separation membrane for pervaporation15US 4,808,313 AAgency of Industrial Science and Technology · 1989
- Micro-porous sheet14US 4,171,987 AFuji Photo Film Co., Ltd. · 1979