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:
Aug. 05, 2003
Filed:
Jan. 28, 1997
Applicant:
Inventor:
Donald Kendall Drummond, Glenmoore, PA (US);
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21C 9/10 ; D21C 9/16 ; D21H 2/122 ;
U.S. Cl.
CPC ...
D21C 9/10 ; D21C 9/16 ; D21H 2/122 ;
Abstract
A method of improving the brightness of calcium carbonate filled paper. The filled paper is dried and then bleached with an aqueous solution of a bleaching agent. The process may be used on all grades of paper that contain filler and is particularly useful in the bleaching of low brightness grade papers that are produced from mechanical pulp that contain calcium carbonate.