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:
Nov. 22, 1994
Filed:
Aug. 11, 1992
Chung-Li Lee, Vancouver, CA;
Robert W Murray, St. Louis, MO (US);
Kenneth Hunt, West Vancouver, CA;
James T Wearing, Vancouver, CA;
Robert M Hogikyan, Burnaby, CA;
Colin W Oloman, Vancouver, CA;
Jianxin Chen, North Vancouver, CA;
Pulp & Paper Research Institute of Canada, Pointe Claire, CA;
The Curators of the University of Missouri, Columbia, MO (US);
Abstract
A chemical pulp which contains reactants capable of generating dioxirane within the pulp is produced in a process which comprises mixing a pulp with reactants comprising a carbonyl compound, preferably acetone, and an oxygen donor, preferably monoperoxysulfate, in proportions which produce a water-soluble dioxirane having a molecular diameter of less than 140 angstrom units. Such a pulp bleaching process which employs dioxirane as a bleaching agent is rendered environmentally and economically acceptable by recycling the reactants employed to produce the dioxirane.