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:
Apr. 01, 2003
Filed:
Dec. 18, 2000
Applicant:
Inventor:
Hannu Juhani Leino, Kalastajankuja, FI;
Assignee:
AGA Aktiebolag, Lidingo, SE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D21H 1/769 ; C01F 1/118 ;
U.S. Cl.
CPC ...
D21H 1/769 ; C01F 1/118 ;
Abstract
The present invention relates to a stabilized calcium carbonate filler, a process for stabilizing calcium carbonate, the use of the stabilized filler in a paper making system, and an improved paper making process wherein calcium carbonate is used as a filler. Specifically, the invention relates to a process wherein the rate of dissolution of calcium carbonate filler is retarded as compared to the rate found in conventional paper making processes. The rate of dissolution is retarded by addition of carbon dioxide to a slurry containing the calcium carbonate filler.