Description
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
D21C
Technology
Sub-Class
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- 0 1446 US PATENTS IN FORCE
- 341 US APPLICATIONS PENDING
- 1291 Total Patent Owners
- 6157 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 |
Recent Patents
Not AvailableRecent Publications
Not AvailableTop Owners in This Class
Top Owners in This Subclass
Applications Filed in This Class - By Year
Applications Filed in This Subclass - By Year
Patents Issued To Date - By Filing Year
Average Time to Issuance
- 36 Months (last 2 years Issuances)
- 36 Months (last 5 years Issuances)
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