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:
Feb. 20, 1990
Filed:
Sep. 29, 1988
Applicant:
Inventors:
Takao Sakabe, Niigata, JP;
Akira Honma, Nagaoka, JP;
Takao Miyamura, Niigata, JP;
Hiroshi Suzuki, Niigata, JP;
Yoshihito Meguro, Niigata, JP;
Assignee:
Hokuetsu Paper Mills, Ltd., Niigata, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D21H / ;
U.S. Cl.
CPC ...
162175 ; 1621811 ; 1621814 ; 1621816 ; 1621818 ;
Abstract
A neutral wood containing paper can be produced by adding, to a stock slurry containing mineral filler and a large majority of high yield pulp, a cationized starch, and thereafter bentonite and colloidal silica either simultaneously or successively with a time interval of at most 60 seconds, resulting in an improved retention of fiber and filler, an improved drainage, and a decreased pitch problem.