D21C 9/1047
Conserving the bleached pulp
Official title: {Conserving the bleached pulp}
D21C9/1047 (Conserving the bleached pulp) appears on 18 US grants and 11 published applications in this corpus.
Search patents in D21C- Granted patents
- 18
- Published applications
- 11
- Assignees
- 21
- Inventors
- 49
- Latest grant
- 18 Mar 2014
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
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| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
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| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 3 |
| 2003 | 1 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 3 |
| 2006 | 1 | 1 |
| 2007 | 1 | 0 |
| 2008 | 1 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 1 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 1 |
| 2024 | 0 | 0 |
| 2025 | 0 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Process for reducing specific energy demand during refining of thermomechanical and chemi-thermomechanical pulp18 Mar 2014US 8,673,113 B2The University of British Columbia
- Light-stable and process-stable lignocellulosic materials and their production10 Jun 2008US 7,384,504 B2FPInnovations
- Bleaching and brightness stabilization of lignocellulosic materials with water-soluble phosphines or phosphonium compounds23 Oct 2007US 7,285,181 B2FPInnovations
- Apparatus for making carboxylated pulp fibers21 Feb 2006US 7,001,483 B2Weyerhaeuser Company
- Method for bleaching mechanical pulp with hydrogen peroxide and an alkaline earth metal carbonate14 Oct 2003US 6,632,328 B2Queen's University at Kingston
- Method for bleaching cellulose pulp formed from recycled textile material9 Jul 2026US 2026/0193838 A1Valmet Corporation
- Process for production of cellulose nanofibers from miscanthus x. giganteus and composites therefrom5 Oct 2023US 2023/0313455 A1The University of Chicago
- Process for reducing specific energy demand during refining of thermomechanical and chemi-thermomechanical pulp15 Dec 2011US 2011/0303372 A1The University of British Columbia
- Methods for improving discoloration resistance of pulp and pulp improved in discoloration resistance21 Sep 2006US 2006/0207732 A1
- Light-stable and process-stable lignocellulosic materials and their production8 Dec 2005US 2005/0269049 A1Pulp and Paper Research Institute of Canada
Most cited
By later US patents
- Preparation of brightness stabilization agent for lignin containing pulp from biomass pyrolysis oils49US 6,193,837 B1Midwest Research Institute · 2001
- Apparatus for making carboxylated pulp fibers42US 7,001,483 B2Weyerhaeuser Company · 2006
- Method for bleaching mechanical pulp with hydrogen peroxide and an alkaline earth metal carbonate34US 6,632,328 B2Queen's University at Kingston · 2003
- Method for treating bleached lignin containing cellulose pulp by reducing .alpha.-carbonyl and .gamma.-carbonyl groups and converting short-wave quanta to long-wave light quanta14US 5,035,772 AMooch Domsjo AB · 1991
- Enhanced dithionite bleaching13US 4,871,423 AHoechst Celanese Corporation · 1989