C08B 13/00
Preparation of cellulose ether-esters
C08B13/00 (Preparation of cellulose ether-esters) appears on 127 US grants and 131 published applications in this corpus.
Search patents in C08B- Granted patents
- 127
- Published applications
- 131
- Assignees
- 68
- Inventors
- 297
- Latest grant
- 6 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 5 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 3 | 0 |
| 1998 | 3 | 0 |
| 1999 | 4 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 3 | 3 |
| 2003 | 2 | 3 |
| 2004 | 1 | 7 |
| 2005 | 0 | 2 |
| 2006 | 4 | 1 |
| 2007 | 0 | 4 |
| 2008 | 1 | 2 |
| 2009 | 1 | 2 |
| 2010 | 1 | 0 |
| 2011 | 2 | 3 |
| 2012 | 1 | 10 |
| 2013 | 3 | 2 |
| 2014 | 1 | 7 |
| 2015 | 5 | 14 |
| 2016 | 8 | 9 |
| 2017 | 5 | 9 |
| 2018 | 7 | 20 |
| 2019 | 8 | 5 |
| 2020 | 10 | 5 |
| 2021 | 8 | 7 |
| 2022 | 3 | 5 |
| 2023 | 3 | 3 |
| 2024 | 1 | 2 |
| 2025 | 2 | 6 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for producing hydroxypropyl methylcellulose acetate succinate6 Jan 2026US 12,516,135 B2Shin-Etsu Chemical Co., Ltd.
- Hydroxypropyl methyl cellulose acetate succinate, method for producing the same, and composition for hot-melt extrusion23 Dec 2025US 12,503,521 B2Shin-Etsu Chemical Co., Ltd.
- Hydroxypropyl methyl cellulose phthalate, method for producing the same, and composition for hot-melt extrusion18 Nov 2025US 12,473,425 B2Shin-Etsu Chemical Co., Ltd.
- Hydroxypropyl methyl cellulose phthalate and method for producing the same16 Jan 2024US 11,873,351 B2Shin-Etsu Chemical Co., Ltd.
- Hydroxypropyl methyl cellulose acetate succinate, method for producing the same, and composition for hot-melt extrusion26 Sep 2023US 11,767,371 B2Shin-Etsu Chemical Co., Ltd.
- Hydroxypropyl methylcellulose acetate succinate and method for producing hydroxypropyl methylcellulose acetate succinate27 Nov 2025US 2025/0361327 A1Shin-Etsu Chemical Co., Ltd.
- Method for producing hydroxypropyl methylcellulose acetate succinate20 Nov 2025US 2025/0353932 A1Shin-Etsu Chemical Co., Ltd.
- Hydroxypropyl methylcellulose acetate succinate and method for producing same20 Nov 2025US 2025/0353933 A1Shin-Etsu Chemical Co., Ltd.
- Hydroxypropyl methyl cellulose phthalate, method for producing the same, and composition for hot-melt extrusion20 Nov 2025US 2025/0353999 A1Shin-Etsu Chemical Co., Ltd.
- Hydroxypropyl methylcellulose acetate succinate powder, and method of producing the same30 Jan 2025US 2025/0034284 A1Shin-Etsu Chemical Co., Ltd.
Most cited
By later US patents
- Blood compatible polymers for blood oxygenation devices47US 4,008,047 ANorth Star Research Institute · 1977
- Acid-curable cellulose esters containing melamine pendent groups47US 5,182,379 AEastman Kodak Company · 1993
- Ether-ester derivatives of cellulose and their applications43US 4,226,981 AShin-Etsu Chemical Co., Ltd. · 1980
- Cellulose derivatives and fibers and membranes made therefrom40US 5,008,385 AAkzo N. V. · 1991
- 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