D21C 3/12

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
8303772 Method for preparing a grass-type unbleached paper productJul 25, 08Nov 06, 12Shandong Fuyin Paper & Environmental Protection Technology Co., Ltd, Shangdong Fuyin Paper & Environmental Protection Technology Co., Ltd.,
5460697 Method of pulping wood chips with a fungi using sulfite salt-treated wood chipsJun 10, 94Oct 24, 95WISCONSIN ALUMNI RESEARCH FOUNDATION
5429716 Process for de-inking recycled paper pulp with a reducing agentJun 28, 93Jul 04, 95MORTON INTERNATIONAL, INC.
4560437 Process for delignification of chemical wood pulp using sodium sulphite or bisulphite prior to oxygen-alkali treatmentJun 22, 84Dec 24, 85M. Peterson & Son A/S
4211605 High yield chemimechanical pulping processesAug 03, 78Jul 08, 80TABERT INC