D21C 9/008
Prevention of corrosion or formation of deposits on pulp-treating equipment
Official title: {Prevention of corrosion or formation of deposits on pulp-treating equipment (D21C9/08, D21H21/02 take precedence)}
D21C9/008 (Prevention of corrosion or formation of deposits on pulp-treating equipment) appears on 66 US grants and 35 published applications in this corpus.
Search patents in D21C- Granted patents
- 66
- Published applications
- 35
- Assignees
- 40
- Inventors
- 103
- Latest grant
- 17 Jun 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 2 | 0 |
| 1981 | 5 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 3 | 0 |
| 1997 | 3 | 0 |
| 1998 | 5 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 2 |
| 2002 | 0 | 0 |
| 2003 | 1 | 4 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 2 | 2 |
| 2007 | 2 | 0 |
| 2008 | 0 | 3 |
| 2009 | 1 | 1 |
| 2010 | 0 | 1 |
| 2011 | 3 | 2 |
| 2012 | 2 | 3 |
| 2013 | 2 | 1 |
| 2014 | 3 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 2 |
| 2018 | 0 | 3 |
| 2019 | 2 | 0 |
| 2020 | 2 | 2 |
| 2021 | 1 | 3 |
| 2022 | 1 | 2 |
| 2023 | 1 | 1 |
| 2024 | 2 | 1 |
| 2025 | 2 | 0 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Black liquor viscosity reducing and anti-scale agent17 Jun 2025US 12,331,461 B2Ecolab USA Inc.
- Method for suppressing sedimentation of suspended substance, method for suppressing pitch trouble, and method for detecting sedimentation of suspended substance11 Mar 2025US 12,247,354 B2Kurita Water Industries Ltd.
- Black liquor viscosity reducing and anti-scale agent20 Feb 2024US 11,905,655 B2Ecolab USA Inc.
- Method for predicting or controlling microbial status of a paper or board making process2 Jan 2024US 11,859,347 B2Kemira Oyj
- Method for controlling growth of microorganisms and/or biofilms in an industrial process9 May 2023US 11,643,782 B2Kemira Oyj
- Compositions and methods for the removal of scale build-up in pulp and paper process30 Apr 2026US 2026/0117460 A1Solenis Technologies, L.P.
- Composition and method for controlling volatile fatty acid content in pulp, paper, and/or board making processes29 Jan 2026US 2026/0028778 A1Solenis Technologies, L.P.
- Black liquor viscosity reducing and anti-scale agent9 May 2024US 2024/0150961 A1Ecolab USA Inc.
- Method of reducing hydrophobic contaminants in a pulping or papermaking process9 Mar 2023US 2023/0071350 A1Solenis Technologies, L.P.
- Method for suppressing sedimentation of suspended substance, method for suppressing pitch trouble, and method for detecting sedimentation of suspended substance13 Oct 2022US 2022/0325473 A1Kurita Water Industries Ltd.
Most cited
By later US patents
- Synergistic blend of biocides71US 4,295,932 ANaloc Chemical Company · 1981
- Method for using urea hydrochloride45US 5,672,279 APeach State Labs, Inc. · 1997
- Biocide42US 4,539,071 ADearborn Chemicals Limited · 1985
- Method of monitoring and inhibiting scale deposition in pulp mill evaporators and concentrators37US 7,985,318 B2Nalco Company · 2011
- System for monitoring contaminants with a detector in a paper pulp stream36US 4,758,308 A1988