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11 claims A. S. T. M. Standards acid adhesive Aktiengesellschaft alkali apparatus April 15 assignor assignor to E. I. bleaching Bull Bumazhnaya Prom Canada 40 cellulose Chem Chemical Chicago E. I. du Pont fibers Fibre Containers 24 Filed April Filed Aug Filed Dec Filed Feb Filed Jan Filed July Filed June Filed March Filed Nov Filed Oct Filed Sept Holzstoff 57 Issued Aug Issued Dec Issued Feb Issued Jan Issued July Issued June Issued Nov Issued Oct Issued Sept July 11 June 13 June 20 lignin manufacture March 11 March 27 Method N. Y. Filed Pacific Pulp Paper paper industry Paper Mill 62 Paper Trade Rev Paper-Maker Papers 22 Papier 19 Papier 42 Papier-Ztg Papierfabr Pappe production pulp and paper Pulp Paper Ind Pulp Paper Mag sheet Southern Pulp Paper sulphite sulphur dioxide Svensk Papperstidn Tech Wochbl wood pulp World's Paper Trade York Zellstoff