D21C 3/226
Use of compounds avoiding scale formation
Official title: {Use of compounds avoiding scale formation}
D21C3/226 (Use of compounds avoiding scale formation) appears on 29 US grants and 19 published applications in this corpus.
Search patents in D21C- Granted patents
- 29
- Published applications
- 19
- Assignees
- 17
- Inventors
- 49
- Latest grant
- 17 Jun 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 1 |
| 2002 | 0 | 0 |
| 2003 | 0 | 2 |
| 2004 | 0 | 2 |
| 2005 | 2 | 2 |
| 2006 | 0 | 0 |
| 2007 | 3 | 2 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 1 | 0 |
| 2011 | 2 | 3 |
| 2012 | 1 | 2 |
| 2013 | 0 | 0 |
| 2014 | 4 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
| 2018 | 0 | 0 |
| 2019 | 1 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 1 | 2 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Black liquor viscosity reducing and anti-scale agent17 Jun 2025US 12,331,461 B2Ecolab USA Inc.
- Black liquor viscosity reducing and anti-scale agent20 Feb 2024US 11,905,655 B2Ecolab USA Inc.
- Method for preventing scale formation27 Aug 2019US 10,392,746 B2Kemira Oyj
- Compositions and processes to increase pulp yield, reduce extractives, and reduce scaling in a chemical pulping process30 Dec 2014US 8,920,602 B2
- Liquid composition sensor in scaling environment16 Sep 2014US 8,834,675 B2Honeywell ASCa Inc.
- Scale inhibition for pulp digesters25 Jul 2024US 2024/0247439 A1Ecolab USA Inc.
- Black liquor viscosity reducing and anti-scale agent9 May 2024US 2024/0150961 A1Ecolab USA Inc.
- Black liquor viscosity reducing and anti-scale agent4 Mar 2021US 2021/0062421 A1Ecolab USA Inc.
- Method for preventing scale formation13 Jul 2017US 2017/0198435 A1Kemira Oyj
- Liquid Composition Sensor in Scaling Environment6 Dec 2012US 2012/0304748 A1Honeywell ASCa Inc.
Most cited
By later US patents
- Method of monitoring and inhibiting scale deposition in pulp mill evaporators and concentrators37US 7,985,318 B2Nalco Company · 2011
- Scale deposit inhibitor for kraft digesters and method for controlling scale deposition in kraft digesters20US 5,409,571 AHakuto Co., Ltd. · 1995
- Process for the prevention of scale formation in wood pulp production18US 5,441,602 AFMC Corporation · 1995
- Controlling scale in black liquor evaporators13US 5,407,583 ACalgon Corporation · 1995
- Process for the inhibition of the formation of deposits in cellulose pulping and cellulose pulp treating processes10US 4,218,284 AMo och Domsjo Aktiebolag · 1980