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:
Jan. 10, 2012
Filed:
Dec. 14, 2005
Applicants:
Sergey M. Shevchenko, Aurora, IL (US);
Prasad Y. Duggirala, Naperville, IL (US);
Inventors:
Sergey M. Shevchenko, Aurora, IL (US);
Prasad Y. Duggirala, Naperville, IL (US);
Assignee:
Nalco Company, Naperville, IL (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D21H 17/62 (2006.01); D21H 21/38 (2006.01); D21H 17/11 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method of decreasing the rate of photoyellowing in paper containing mechanical pulp comprising: applying an aqueous solution containing an effective amount of one or more salts of thiocyanic acid on the surface of a paper sheet in a papermaking process.