D01F 13/02
Recovery of starting material, waste material or solvents during the manufacture of
Official title: of cellulose, cellulose derivatives or proteins {(recovery of sodium sulfate from coagulation baths C01D5/006)}
D01F13/02 (Recovery of starting material, waste material or solvents during the manufacture of) appears on 50 US grants and 52 published applications in this corpus.
Search patents in D01F- Granted patents
- 50
- Published applications
- 52
- Assignees
- 44
- Inventors
- 153
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 1 |
| 2002 | 1 | 0 |
| 2003 | 1 | 0 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 4 |
| 2014 | 0 | 2 |
| 2015 | 3 | 1 |
| 2016 | 2 | 3 |
| 2017 | 1 | 0 |
| 2018 | 3 | 1 |
| 2019 | 1 | 4 |
| 2020 | 0 | 3 |
| 2021 | 4 | 4 |
| 2022 | 4 | 8 |
| 2023 | 3 | 7 |
| 2024 | 3 | 7 |
| 2025 | 4 | 4 |
| 2026 | 3 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for providing a filtered spinning dope12 May 2026US 12,624,477 B2Treetotextile AB
- Lyocell fibers and methods of producing the same17 Mar 2026US 12,577,706 B2Aalto University Foundation sr
- Quantitative Raman spectroscopy10 Mar 2026US 12,571,737 B2Aalto University Foundation sr
- Recycling of acid-superbase conjugate ionic liquids by water removal in the lyocell spinning process30 Dec 2025US 12,509,801 B2Aalto University Foundation sr
- Textile recycling23 Dec 2025US 12,503,799 B2Apani Systems Inc.
- A method of treating regenerated cellulose fiber for textile and non-woven applications20 Aug 2026US 2026/0243016 A1Asia Pacific Rayon Limited
- Method for preparing lyocell fibers from sugarcane bagasse as raw material19 Mar 2026US 2026/0078530 A1Jinjiang Anrun Textile Co., Ltd.
- Method for degumming silk fibers8 May 2025US 2025/0146182 A1Yeda Research and Development Co. Ltd.
- A high tenacity regenerated cellulosic fiber13 Feb 2025US 2025/0051971 A1Grasim Industries Limited
- Cellulosic textile fibre13 Feb 2025US 2025/0051972 A1Infinited Fiber Company Oy
Most cited
By later US patents
- Electrodialytic water splitting process and apparatus for conversion of alkali metal sulfate values derived from spent rayon spin baths38US 4,504,373 AAllied Corporation · 1985
- Process for the concentration of sulfuric acid16US 4,613,416 AHoechst Aktiengesellschaft · 1986
- Process of making regenerated cellulose articles13US 5,441,689 ACourtaulds Limited · 1995
- Process for purifying an aqueous solution of N-methyl-morpholine N-oxide12US 5,053,138 ALenzing Aktiengesellschaft · 1991
- Viscose rayon spinning machine11US 4,477,951 AFiber Associates, Inc. · 1984