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. 02, 1999
Filed:
Sep. 25, 1997
Applicant:
Inventors:
Shigenao Kawakami, Ilkoma-gun, JP;
Nobuyuki Matsuda, Sakai, JP;
Hiroshi Horiuchi, Toyonaka, JP;
Norio Kondo, Minoo, JP;
Assignee:
Sumitomo Chemical Company, Limited, Osaka-fu, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21H / ;
U.S. Cl.
CPC ...
162158 ; 1621682 ; 1621683 ; 162179 ; 162183 ;
Abstract
This invention relates to a process for papermaking which comprises forming a sheet in the presence of a neutral sizing agent and optionally a filler using as a paper quality improver a cationic polymer which is prepared by copolymerizing an acrylamide compound of the formula: