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:
May. 30, 2006
Filed:
Jan. 26, 2001
Mark T. Wajer, Nottingham, MD (US);
Aileen R. Gibson, Owings Mills, MD (US);
Joseph Genco, Orono, ME (US);
Donna Johnson, Orono, ME (US);
Burton Branch, Fredericton, NB, CA;
Mark T. Wajer, Nottingham, MD (US);
Aileen R. Gibson, Owings Mills, MD (US);
Joseph Genco, Orono, ME (US);
Donna Johnson, Orono, ME (US);
Burton Branch, Fredericton, NB, CA;
Martin Marietta Magnesia Specialties, Inc., Raleigh, NC (US);
Abstract
Wood pulp is bleached using hydrogen peroxide as the oxidative bleaching agent in the presence of magnesium hydroxide or magnesium oxide. The bleaching process is carried out in the presence of magnesium hydroxide as the predominant, and preferably essential, source of alkali. The process optionally includes transition metal chelants, such as DTPA or EDTA in the bleaching slurry. The process eliminates the need for added caustic and silicate in such systems and can be carried out at or near neutral pH of 5.0 to 8.5.