D21H 13/06
Cellulose esters
D21H13/06 (Cellulose esters) appears on 86 US grants and 60 published applications in this corpus.
Search patents in D21H- Granted patents
- 86
- Published applications
- 60
- Assignees
- 32
- Inventors
- 116
- Latest grant
- 18 Jun 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 3 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 3 | 0 |
| 1997 | 4 | 0 |
| 1998 | 3 | 0 |
| 1999 | 3 | 0 |
| 2000 | 3 | 0 |
| 2001 | 7 | 0 |
| 2002 | 2 | 3 |
| 2003 | 2 | 1 |
| 2004 | 1 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 1 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 1 |
| 2014 | 2 | 4 |
| 2015 | 1 | 3 |
| 2016 | 1 | 1 |
| 2017 | 2 | 3 |
| 2018 | 1 | 1 |
| 2019 | 0 | 2 |
| 2020 | 0 | 33 |
| 2021 | 4 | 2 |
| 2022 | 28 | 2 |
| 2023 | 3 | 0 |
| 2024 | 1 | 0 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Fibrous cellulose and method for manufacturing the same, and fibrous cellulose composite resin and method for manufacturing the same18 Jun 2024US 12,012,469 B2Daio Paper Corporation
- Phosphoric acid-esterified fine cellulose fiber and method for producing the same29 Aug 2023US 11,739,165 B2Oji Holdings Corporation
- Ultrasonic welding of wet laid nonwoven compositions6 Jun 2023US 11,668,050 B2Eastman Chemical Company
- Recycle pulp comprising cellulose acetate2 May 2023US 11,639,579 B2Eastman Chemical Company
- Composition of matter in a pre-refiner blend zone20 Dec 2022US 11,530,516 B2Eastman Chemical Company
- Segment for a smoking article comprising a calendered fiber web24 Apr 2025US 2025/0127208 A1delfortgroup AG
- Recycle bale comprising cellulose ester7 Apr 2022US 2022/0106738 A1Eastman Chemical Company
- Ultrasonic welding of wet laid nonwoven compositions10 Feb 2022US 2022/0042246 A1Eastman Chemical Company
- Phosphoric acid-esterified fine cellulose fiber and method for producing the same16 Sep 2021US 2021/0284755 A1Oji Holdings Corporation
- Fibrous cellulose and method for manufacturing the same, and fibrous cellulose composite resin and method for manufacturing the same29 Jul 2021US 2021/0230312 A1Daio Paper Corporation
Most cited
By later US patents
- Wet laid bonded fibrous web containing bicomponent fibers including LLDPE116US 5,167,765 AHoechst Celanese Corporation · 1992
- Process for preparation of cellulose acetate filters for use in paper making108US 5,662,773 AEastman Chemical Company · 1997
- Filter material80US 4,274,914 ACelanese Corporation · 1981
- Wet laid bonded fibrous web68US 5,167,764 AHoechst Celanese Corporation · 1992
- High strength, low pressure drop adsorbent wheel63US 5,685,897 ALaRoche Industries, Inc. · 1997