D21H 21/20
Wet strength agents
D21H21/20 (Wet strength agents) appears on 621 US grants and 601 published applications in this corpus.
Search patents in D21H- Granted patents
- 621
- Published applications
- 601
- Assignees
- 186
- Inventors
- 1,041
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 6 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 5 | 0 |
| 1990 | 7 | 0 |
| 1991 | 5 | 0 |
| 1992 | 6 | 0 |
| 1993 | 4 | 0 |
| 1994 | 5 | 0 |
| 1995 | 5 | 0 |
| 1996 | 7 | 0 |
| 1997 | 11 | 0 |
| 1998 | 12 | 0 |
| 1999 | 11 | 0 |
| 2000 | 19 | 0 |
| 2001 | 29 | 5 |
| 2002 | 25 | 21 |
| 2003 | 13 | 24 |
| 2004 | 10 | 18 |
| 2005 | 12 | 17 |
| 2006 | 8 | 16 |
| 2007 | 12 | 6 |
| 2008 | 1 | 15 |
| 2009 | 10 | 16 |
| 2010 | 18 | 22 |
| 2011 | 16 | 10 |
| 2012 | 18 | 21 |
| 2013 | 18 | 13 |
| 2014 | 12 | 22 |
| 2015 | 16 | 45 |
| 2016 | 46 | 32 |
| 2017 | 32 | 33 |
| 2018 | 17 | 39 |
| 2019 | 16 | 29 |
| 2020 | 36 | 38 |
| 2021 | 27 | 30 |
| 2022 | 27 | 29 |
| 2023 | 28 | 40 |
| 2024 | 23 | 20 |
| 2025 | 16 | 17 |
| 2026 | 18 | 23 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method of preparing aldehyde-functionalized polymers29 Sep 2026US 12,747,307 B2Ecolab USA Inc.
- Method, apparatus, and system of a fibrillated nanocellulose material4 Aug 2026US 12,698,596 B2Ecoinno (H.K.) Limited
- Additive compositions for papermaking5 May 2026US 12,618,197 B2Solenis Technologies, L.P.
- Absorbent paper products having unique physical strength properties28 Apr 2026US 12,612,738 B2Mercer International Inc.
- Process for manufacturing wet strength resins21 Apr 2026US 12,606,673 B2Kemira Oyj
- Paper substrate for fibrous casing substrate8 Oct 2026US 2026/0308848 A1Nippon Paper Papylia Co., Ltd.
- Pae-free papermaking machine and methods of making paper products using the same20 Aug 2026US 2026/0243029 A1First Quality Tissue, LLC
- Premium Sanitary Tissue Products Comprising Non-wood Fibers30 Jul 2026US 2026/0218456 A1The Procter & Gamble Company
- Wet laid paper and paperboard products with high wet strength and method of making the same16 Jul 2026US 2026/0201642 A1First Quality Tissue, LLC
- Soft treated tissue having improved hand protection9 Jul 2026US 2026/0193847 A1Kimberly-Clark Worldwide, Inc.
Most cited
By later US patents
- Dual-zoned absorbent webs287US 5,990,377 AKimberly-Clark Worldwide, Inc. · 1999
- Fabric creped absorbent sheet with variable local basis weight270US 7,494,563 B2Georgia-Pacific Consumer Products LP · 2009
- Dual-zoned absorbent webs269US 6,395,957 B1Kimberly-Clark Worldwide, Inc. · 2002
- Fabric crepe process for making absorbent sheet217US 7,399,378 B2Georgia-Pacific Consumer Products LP · 2008
- Multifunctional tissue paper product199US 6,162,327 AThe Procter & Gamble Company · 2000