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:
Sep. 28, 1999
Filed:
Jan. 29, 1998
Applicant:
Inventors:
Toshiaki Kanada, Tokyo, JP;
Seikyu Jinnouchi, Tokyo, JP;
Masafumi Shimpo, Tokyo, JP;
Tetsuo Koshitsuka, Tokyo, JP;
Akiko Kimura, Tokyo, JP;
Assignee:
Mitsubishi Gas Chemical Company Inc., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
D21C / ;
U.S. Cl.
CPC ...
162 72 ; 162-5 ; 162-6 ; 162 76 ; 162 78 ; 562126 ; 564 30 ;
Abstract
A process for producing a thiourea dioxide fluid by mixing thiourea and a peroxide, or thiourea, a peroxide and a reaction catalyst, or thiourea, a peroxide, a reaction catalyst and a chelating agent, in the absence or presence of pulp and a process for bleaching pulp by the use of the thiourea dioxide fluid produced by the above process economically advantageously with a small chemicals loss and by small consumption of energy.