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. 29, 2008
Filed:
Jun. 18, 2002
Applicants:
Gordon Cheng Chen, Chesapeake, VA (US);
Stephanie Caine Williams, Suffolk, VA (US);
Swindell Allen Grimsley, Chesapeake, VA (US);
Inventors:
Gordon Cheng Chen, Chesapeake, VA (US);
Stephanie Caine Williams, Suffolk, VA (US);
Swindell Allen Grimsley, Chesapeake, VA (US);
Assignee:
Ciba Specialty Chemicals Water Treatments Ltd., West Yorkshire, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21F 11/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
Process for making paper or paper board comprising, forming an aqueous cellulosic suspension, adding a retention system to the cellulosic suspension, draining the suspension on a screen to form a sheet and drying the sheet, wherein the retention system comprises a swelling clay which has a TAPPI brightness of at least 70.