D21H 17/44
Cationic
Official title: cationic
D21H17/44 (Cationic) appears on 575 US grants and 393 published applications in this corpus.
Search patents in D21H- Granted patents
- 575
- Published applications
- 393
- Assignees
- 220
- Inventors
- 1,157
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 6 | 0 |
| 1978 | 11 | 0 |
| 1979 | 8 | 0 |
| 1980 | 10 | 0 |
| 1981 | 14 | 0 |
| 1982 | 14 | 0 |
| 1983 | 14 | 0 |
| 1984 | 15 | 0 |
| 1985 | 10 | 0 |
| 1986 | 10 | 0 |
| 1987 | 5 | 0 |
| 1988 | 9 | 0 |
| 1989 | 12 | 0 |
| 1990 | 14 | 0 |
| 1991 | 10 | 0 |
| 1992 | 15 | 0 |
| 1993 | 17 | 0 |
| 1994 | 10 | 0 |
| 1995 | 10 | 0 |
| 1996 | 17 | 0 |
| 1997 | 13 | 0 |
| 1998 | 11 | 0 |
| 1999 | 12 | 0 |
| 2000 | 13 | 0 |
| 2001 | 13 | 0 |
| 2002 | 9 | 12 |
| 2003 | 6 | 12 |
| 2004 | 8 | 12 |
| 2005 | 3 | 14 |
| 2006 | 2 | 21 |
| 2007 | 7 | 9 |
| 2008 | 2 | 17 |
| 2009 | 4 | 15 |
| 2010 | 12 | 25 |
| 2011 | 15 | 16 |
| 2012 | 17 | 20 |
| 2013 | 18 | 18 |
| 2014 | 28 | 19 |
| 2015 | 17 | 22 |
| 2016 | 11 | 10 |
| 2017 | 19 | 23 |
| 2018 | 13 | 14 |
| 2019 | 9 | 20 |
| 2020 | 20 | 12 |
| 2021 | 10 | 16 |
| 2022 | 14 | 9 |
| 2023 | 5 | 21 |
| 2024 | 10 | 23 |
| 2025 | 10 | 5 |
| 2026 | 7 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Starch fixation and retention in recycled fiber systems28 Jul 2026US 12,692,654 B2Kemira Oyj
- 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.
- Treatment system for manufacture of paper, board or the like21 Apr 2026US 12,606,959 B2Kemira Oyj
- Static mixer for electrical submersible pump (ESP) high gas/oil ratio (GOR) completions3 Mar 2026US 12,565,736 B2Saudi Arabian Oil Company
- Paper substrate for fibrous casing substrate8 Oct 2026US 2026/0308848 A1Nippon Paper Papylia Co., Ltd.
- Treatment system and method for manufacture of paper, board or the like27 Aug 2026US 2026/0250909 A1Kemira Oyj
- Dual emulsification of alkenyl succinic anhydride to improve sizing performance and stability20 Aug 2026US 2026/0243024 A1Kemira Oyj
- Water soluble amphoteric emulsion terpolymers, methods of making, and methods of use as retention and dewatering aids30 Jul 2026US 2026/0218455 A1
- Stretchable paper23 Jul 2026US 2026/0210057 A1Billerud Aktiebolag (publ)
Most cited
By later US patents
- Production of paper and paperboard198US 4,753,710 AAllied Colloids Limited · 1988
- Temporary wet strength resins with nitrogen heterocyclic nonnucleophilic functionalities and paper products containing same167US 4,981,557 AThe Procter & Gamble Company · 1991
- Temporary wet strength resin165US 4,605,702 AAmerican Cyanamid Company · 1986
- Temporary wet strength resins and paper products containing same144US 5,085,736 AThe Procter & Gamble Company · 1992
- Linear basic polymers, their preparation and their use136US 4,421,602 ABASF SE · 1983