D01F 2/28
From organic cellulose esters or ethers
Official title: from organic cellulose esters or ethers, e.g. cellulose acetate
D01F2/28 (From organic cellulose esters or ethers) appears on 205 US grants and 203 published applications in this corpus.
Search patents in D01F- Granted patents
- 205
- Published applications
- 203
- Assignees
- 131
- Inventors
- 615
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 4 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 4 | 0 |
| 1981 | 4 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 4 | 0 |
| 1989 | 5 | 0 |
| 1990 | 1 | 0 |
| 1991 | 5 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 1 | 0 |
| 1995 | 5 | 0 |
| 1996 | 11 | 0 |
| 1997 | 5 | 0 |
| 1998 | 5 | 0 |
| 1999 | 6 | 0 |
| 2000 | 8 | 0 |
| 2001 | 4 | 1 |
| 2002 | 5 | 8 |
| 2003 | 3 | 4 |
| 2004 | 4 | 1 |
| 2005 | 3 | 4 |
| 2006 | 4 | 0 |
| 2007 | 0 | 4 |
| 2008 | 1 | 6 |
| 2009 | 4 | 0 |
| 2010 | 1 | 3 |
| 2011 | 0 | 8 |
| 2012 | 3 | 7 |
| 2013 | 5 | 6 |
| 2014 | 4 | 11 |
| 2015 | 6 | 13 |
| 2016 | 9 | 15 |
| 2017 | 3 | 6 |
| 2018 | 11 | 12 |
| 2019 | 8 | 10 |
| 2020 | 5 | 19 |
| 2021 | 8 | 17 |
| 2022 | 9 | 13 |
| 2023 | 8 | 11 |
| 2024 | 6 | 8 |
| 2025 | 3 | 8 |
| 2026 | 5 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- High efficiency synthetic filter media1 Sep 2026US 12,722,107 B2Knowlton Technologies, LLC
- Alginate-based fibers and uses thereof2 Jun 2026US 12,644,206 B2Fashion Institute of Technology
- Fibrillated fiber and method for preparing the same5 May 2026US 12,617,938 B2LG Chem.Ltd.
- Cellulose acetate band, and method for producing cellulose acetate band31 Mar 2026US 12,590,387 B2Daicel Corporation
- Polymer complex10 Feb 2026US 12,545,775 B2LG Chem.Ltd.
- Cellulose acetate filaments having a cross-sectional shape with a specific surface area index20 Aug 2026US 2026/0240230 A1Acetate International LLC
- Cellulose acetate filaments having a cross-sectional shape with a specific surface area index20 Aug 2026US 2026/0240231 A1Acetate International LLC
- Cellulose acetate fibers in nonwoven fabrics20 Aug 2026US 2026/0242984 A1Eastman Chemical Company
- Blended cellulose acetate fiber and process for the making thereof13 Aug 2026US 2026/0234837 A1Eastman Chemical Company
- Cellulose esters and cellulose ester fibers having recycled content from multiple sources5 Mar 2026US 2026/0062502 A1Eastman Chemical Company
Most cited
By later US patents
- Tobacco smoke filter materials, fibrous cellulose esters, and production processes70US 5,863,652 ADaicel Chemical Industries, Ltd. · 1999
- Process for forming a skinless hollow fiber of a cellulose ester49US 4,744,932 ACelanese Corporation · 1988
- Cellulose ester compositions and shaped articles49US 5,804,296 ADaicel Chemical Industries, Ltd. · 1998
- Production of discrete cellulose acetate fibers by emulsion flashing48US 4,040,856 ACrown Zellerbach Corporation · 1977
- Environmentally non-persistant cellulose ester fibers41US 5,970,988 AEastman Kodak Company · 1999