The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 24, 1978
Filed:
Jun. 14, 1972
Hiroshi Matsuura, Tokyo, JA;
Japan Pulp & Paper Research Instutute Inc., Tokyo, JA;
Abstract
A pulping process which includes the steps of oxidizing vegetable materials with an oxidizing chemical selected from the group comprising Cl.sub.2, Cl.sub.2 O,ClO.sub. 2, Mg(ClO).sub.2, Mg(ClO.sub.2).sub.2 Mg.(ClO.sub. 3).sub.2 and mixtures thereof, extracting the oxidized materials with Mg(OH).sub.2 thereby to delignify and bleach the materials and treating the waste liquor from the oxidation, extraction and washing steps by combustion or thermal decomposition thereby to regenerate the chemicals necessary for the oxidation and extraction steps. The process of the invention produces semi-bleached or completely bleached pulp of high strength with high yield while eliminating the problem relating to environmental pollution.