D21H 17/15
Polycarboxylic acids
Official title: Polycarboxylic acids, e.g. maleic acid
D21H17/15 (Polycarboxylic acids) appears on 251 US grants and 204 published applications in this corpus.
Search patents in D21H- Granted patents
- 251
- Published applications
- 204
- Assignees
- 140
- Inventors
- 618
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 11 | 0 |
| 1986 | 3 | 0 |
| 1987 | 8 | 0 |
| 1988 | 7 | 0 |
| 1989 | 9 | 0 |
| 1990 | 3 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 7 | 0 |
| 1994 | 3 | 0 |
| 1995 | 5 | 0 |
| 1996 | 3 | 0 |
| 1997 | 10 | 0 |
| 1998 | 4 | 0 |
| 1999 | 8 | 0 |
| 2000 | 9 | 0 |
| 2001 | 12 | 1 |
| 2002 | 10 | 2 |
| 2003 | 7 | 7 |
| 2004 | 6 | 5 |
| 2005 | 0 | 5 |
| 2006 | 0 | 11 |
| 2007 | 0 | 10 |
| 2008 | 2 | 9 |
| 2009 | 2 | 11 |
| 2010 | 7 | 8 |
| 2011 | 6 | 6 |
| 2012 | 8 | 12 |
| 2013 | 7 | 2 |
| 2014 | 6 | 10 |
| 2015 | 1 | 8 |
| 2016 | 0 | 9 |
| 2017 | 13 | 6 |
| 2018 | 7 | 3 |
| 2019 | 6 | 11 |
| 2020 | 4 | 8 |
| 2021 | 6 | 8 |
| 2022 | 10 | 8 |
| 2023 | 4 | 13 |
| 2024 | 10 | 12 |
| 2025 | 8 | 12 |
| 2026 | 4 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Moisture/oil resistant composite materials29 Sep 2026US 12,747,536 B2World Centric
- Paper tube for smoking articles with flavored sheet, and smoking article31 Mar 2026US 12,588,701 B2Kt&G Corporation
- Polymer dispersion, its use and process for its preparation10 Mar 2026US 12,570,781 B2Kemira Oyj
- Hemp paper packaging material for foodstuff17 Feb 2026US 12,553,184 B2Wm. Wrigley Jr. Company
- Method for on-site glyoxylation of polyacrylamide11 Nov 2025US 12,467,204 B2Kemira Oyj
- Dual emulsification of alkenyl succinic anhydride to improve sizing performance and stability20 Aug 2026US 2026/0243024 A1Kemira Oyj
- Packing material and manufacturing method of packing material13 Aug 2026US 2026/0234872 A1Sony Group Corporation
- Composition23 Jul 2026US 2026/0210051 A1Daikin Industries, Ltd.
- Preparation method of biodegradable and antibacterial bamboo fiber-based paper straw9 Jul 2026US 2026/0193846 A1Northeast Forestry University
- Hemp paper packaging material for foodstuff21 May 2026US 2026/0139435 A1North Carolina State University
Most cited
By later US patents
- Crosslinked cellulose products and method for their preparation114US 5,225,047 AWeyerhaeuser Company · 1993
- Compressible wood pulp product83US 6,638,884 B2Weyerhaeuser Company · 2003
- Method of sizing paper81US 4,040,900 ANational Starch and Chemical Corporation · 1977
- Decor sheet and decorative laminates prepared therefrom79US 5,601,930 AThe Mead Corporation · 1997
- Aqueous sizing compositions75US 4,522,686 AHercules Incorporated · 1985