Description
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
D21C
Technology
Stats
- 1,818 US PATENTS IN FORCE
- 615 US APPLICATIONS PENDING
- 1,291 Total Patent Owners
- 6,863 TOTAL INVENTORS
Subclasses
| Subclass | Title |
|---|---|
| 1/00 | Pretreatment of the finely-divided materials before digesting (of waste paper D21C 5/02) |
| 1/02 | Pretreatment of the finely-divided materials before digesting (of waste paper D21C 5/02) with water or steam |
| 1/04 | Pretreatment of the finely-divided materials before digesting (of waste paper D21C 5/02) with acid reacting compounds |
| 1/06 | Pretreatment of the finely-divided materials before digesting (of waste paper D21C 5/02) with alkaline reacting compounds |
| 1/08 | Pretreatment of the finely-divided materials before digesting (of waste paper D21C 5/02) with oxygen-generating compounds |
| 1/10 | Pretreatment of the finely-divided materials before digesting (of waste paper D21C 5/02) Physical methods for facilitating impregnation |
| 3/00 | Pulping cellulose-containing materials (digesters D21C 7/00) |
| 3/02 | Pulping cellulose-containing materials (digesters D21C 7/00) with inorganic bases or alkaline reacting compounds, e.g. sulfate processes |
| 3/04 | Pulping cellulose-containing materials (digesters D21C 7/00) with acids, acid salts, or acid anhydrides |
| 3/06 | Pulping cellulose-containing materials (digesters D21C 7/00) with acids, acid salts, or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites |
| 3/08 | Pulping cellulose-containing materials (digesters D21C 7/00) with acids, acid salts, or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites calcium bisulfite |
| 3/10 | Pulping cellulose-containing materials (digesters D21C 7/00) with acids, acid salts, or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites magnesium bisulfite |
| 3/12 | Pulping cellulose-containing materials (digesters D21C 7/00) with acids, acid salts, or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sodium bisulfite |
| 3/14 | Pulping cellulose-containing materials (digesters D21C 7/00) with acids, acid salts, or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites ammonium bisulfite |
| 3/16 | Pulping cellulose-containing materials (digesters D21C 7/00) with acids, acid salts, or acid anhydrides nitrogen oxides; nitric acid |
| 3/18 | Pulping cellulose-containing materials (digesters D21C 7/00) with halogens or halogen-generating compounds (bleaching cellulose pulp D21C 9/12) |
| 3/20 | Pulping cellulose-containing materials (digesters D21C 7/00) with organic solvents |
| 3/22 | Pulping cellulose-containing materials (digesters D21C 7/00) Other features of pulping processes |
| 3/24 | Pulping cellulose-containing materials (digesters D21C 7/00) Other features of pulping processes Continuous processes |
| 3/26 | Pulping cellulose-containing materials (digesters D21C 7/00) Other features of pulping processes Multi-stage processes |
Recent Patents
Not Available
Recent Publications
| Publication # | Title | Filing Date | Pub Date | Patent Owner |
|---|---|---|---|---|
| 2024/0124,986 | METHOD FOR PRODUCING ALKALI METAL/ALKALINE EARTH METAL HYDROXIDE AND APPLICATION OF SAID PRODUCTION METHOD TO CARBOXYLATE WASTE RECYCLING TECHNOLOGY | Feb 21, 22 | Apr 18, 24 | TOHOKU UNIVERSITY |
| 2024/0116,835 | LIGNOCELLULOSE REFINERY | Oct 28, 21 | Apr 11, 24 | Not available |
| 2024/0117,566 | DEVICE AND METHOD FOR TREATING GREEN LIQUOR | Apr 20, 22 | Apr 11, 24 | Valmet AB |
| 2024/0110,169 | GH61 VARIANTS AND POLYNUCLEOTIDES ENCODING SAME | Nov 30, 23 | Apr 04, 24 | Novozymes A/S; Novozymes, Inc.; |
| 2024/0102,064 | METHODS OF PROCESSING LIGNOCELLULOSIC BIOMASS USING SINGLE-STAGE AUTOHYDROLYSIS AND ENZYMATIC HYDROLYSIS WITH C5 BYPASS AND POST-HYDROLYSIS | Nov 29, 23 | Mar 28, 24 | Inbicon A/S |
| 2024/0102,238 | PROCESS FOR PRODUCING AND USING FIBRILLATED BIODEGRADABLE MICROFIBERS | Sep 22, 23 | Mar 28, 24 | Not available |
| 2024/0102,239 | FIBROUS BODY PROCESSING APPARATUS | Sep 26, 23 | Mar 28, 24 | Not available |
| 2024/0102,240 | FIBROUS BODY PROCESSING APPARATUS | Sep 26, 23 | Mar 28, 24 | Not available |
| 2024/0102,241 | INTEGRATED KRAFT PULP MILL AND THERMOCHEMICAL CONVERSION SYSTEM | Nov 02, 23 | Mar 28, 24 | Canfor Pulp Ltd.; Licella Pty Ltd.; |
Top Owners in This Class
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Applications Filed in This Class - By Year
Patents Issued To Date - By Filing Year
Average Time to Issuance
- 37 Months (last 2 years Issuances)
- 37 Months (last 5 years Issuances)