Patents by Inventor Qing Long Rao

Qing Long Rao has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10145067
    Abstract: Methods of improving dewatering efficiency, increasing sheet wet web strength, increasing sheet wet strength, and enhancing filler retention in a papermaking process are disclosed. The methods improve the efficiency of drainage aids, wet web strength aids, and/or wet strength aids by coating at least some of the filler particles with a material that prevents the filler materials form adhering to a those additives.
    Type: Grant
    Filed: September 21, 2016
    Date of Patent: December 4, 2018
    Assignee: ECOLAB USA INC.
    Inventors: Yulin Zhao, Jun Li, Qing Long Rao, Stephen Ashton, Weiguo Cheng, Aleksandar Todorovic, Alan Smith
  • Publication number: 20170009399
    Abstract: Methods of improving dewatering efficiency, increasing sheet wet web strength, increasing sheet wet strength, and enhancing filler retention in a papermaking process are disclosed. The methods improve the efficiency of drainage aids, wet web strength aids, and/or wet strength aids by coating at least some of the filler particles with a material that prevents the filler materials form adhering to a those additives.
    Type: Application
    Filed: September 21, 2016
    Publication date: January 12, 2017
    Applicant: NALCO Company
    Inventors: Yulin Zhao, Jun Li, Qing Long Rao, Stephen Ashton, Weiguo Cheng, Aleksandar Todorovic, Alan Smith
  • Patent number: 9506202
    Abstract: The invention is directed towards methods, compositions, and apparatus for increasing the strength of paper made out of a furnish having a large proportion of OCC. The method involves the following steps: 1) Providing a paper furnish having a large amount of OCC in it, 2) adding strength promoter to the furnish prior to adding a strength agent to the furnish, 3) adding a strength agent to the furnish, and 4) making a paper product from the furnish. This method allows cheap OCC material to be used in a papermaking process without the quality problems that the anionic trash in OCC typically causes. Thus paper products having low costs and high quality can be produced.
    Type: Grant
    Filed: November 10, 2014
    Date of Patent: November 29, 2016
    Assignee: NALCO Company
    Inventors: Yulin Zhao, Jun Li, Qing Long Rao, Weiguo Cheng
  • Patent number: 9487916
    Abstract: The invention provides a method of improving dewatering efficiency, increasing sheet wet web strength, increasing sheet wet strength and enhancing filler retention in a papermaking process The method improves the efficiency of drainage aids or wet web strength aids or wet strength aid by coating at least some of the filler particles with a material that prevents the filler materials form adhering to a those additives. The drainage additive or wet web strength additive or wet strength aid holds the cellulose fibers together tightly and is not wasted on the filler particles.
    Type: Grant
    Filed: June 17, 2013
    Date of Patent: November 8, 2016
    Assignee: NALCO Company
    Inventors: Yulin Zhao, Jun Li, Qing Long Rao, Stephen Ashton, Weiguo Cheng, Aleksandar Todorovic, Alan Smith
  • Publication number: 20150059998
    Abstract: The invention is directed towards methods, compositions, and apparatus for increasing the strength of paper made out of a furnish having a large proportion of OCC. The method involves the following steps: 1) Providing a paper furnish having a large amount of OCC in it, 2) adding strength promoter to the furnish prior to adding a strength agent to the furnish, 3) adding a strength agent to the furnish, and 4) making a paper product from the furnish. This method allows cheap OCC material to be used in a papermaking process without the quality problems that the anionic trash in OCC typically causes. Thus paper products having low costs and high quality can be produced.
    Type: Application
    Filed: November 10, 2014
    Publication date: March 5, 2015
    Applicant: NALCO COMPANY
    Inventors: Yulin Zhao, Jun Li, Qing Long Rao, Weiguo Cheng
  • Patent number: 8882964
    Abstract: The invention is directed towards methods, compositions, and apparatus for increasing the strength of paper made out of a furnish having a large proportion of OCC. The method involves the following steps: 1) Providing a paper furnish having a large amount of OCC in it, 2) adding strength promoter to the furnish prior to adding a strength agent to the furnish, 3) adding a strength agent to the furnish, and 4) making a paper product from the furnish. This method allows cheap OCC material to be used in a papermaking process without the quality problems that the anionic trash in OCC typically causes. Thus paper products having low costs and high quality can be produced.
    Type: Grant
    Filed: February 17, 2012
    Date of Patent: November 11, 2014
    Assignee: Nalco Company
    Inventors: Yulin Zhao, Jun Li, Qing Long Rao, Weiguo Cheng
  • Patent number: 8709208
    Abstract: The invention provides a method of improving dewatering efficiency, increasing sheet wet web strength, increasing sheet wet strength and enhancing filler retention in a papermaking process. The method improves the efficiency of dewatering aid by coating at least some of the filler particles with a material that prevents the filler materials form adhering to dewatering aids. The dewatering aid holds the paper fibers together tightly and is not wasted on the filler particles.
    Type: Grant
    Filed: May 25, 2012
    Date of Patent: April 29, 2014
    Assignee: Nalco Company
    Inventors: Yulin Zhao, Jun Li, Qing Long Rao, Weiguo Cheng
  • Publication number: 20130306261
    Abstract: The invention provides a method of improving dewatering efficiency, increasing sheet wet web strength, increasing sheet wet strength and enhancing filler retention in a papermaking process. The method improves the efficiency of dewatering aid by coating at least some of the filler particles with a material that prevents the filler materials form adhering to dewatering aids. The dewatering aid holds the paper fibers together tightly and is not wasted on the filler particles.
    Type: Application
    Filed: May 25, 2012
    Publication date: November 21, 2013
    Inventors: Yulin ZHAO, Jun LI, Qing Long RAO, Weiguo CHENG
  • Publication number: 20130299110
    Abstract: The invention provides a method of improving dewatering efficiency, increasing sheet wet web strength, increasing sheet wet strength and enhancing filler retention in a papermaking process The method improves the efficiency of drainage aids or wet web strength aids or wet strength aid by coating at least some of the filler particles with a material that prevents the filler materials form adhering to a those additives. The drainage additive or wet web strength additive or wet strength aid holds the cellulose fibers together tightly and is not wasted on the filler particles.
    Type: Application
    Filed: June 17, 2013
    Publication date: November 14, 2013
    Inventors: Yulin Zhao, Jun Li, Qing Long Rao, Weiguo Cheng
  • Patent number: 8465623
    Abstract: The invention provides a method of improving dewatering efficiency, increasing sheet wet web strength, increasing sheet wet strength and enhancing filler retention in a papermaking process The method improves the efficiency of drainage aids or wet web strength aids or wet strength aid by coating at least some of the filler particles with a material that prevents the filler materials form adhering to a those additives. The drainage additive or wet web strength additive or wet strength aid holds the cellulose fibers together tightly and is not wasted on the filler particles.
    Type: Grant
    Filed: October 13, 2011
    Date of Patent: June 18, 2013
    Assignee: Nalco Company
    Inventors: Yulin Zhao, Jun Li, Qing Long Rao, Weiguo Cheng
  • Publication number: 20130133847
    Abstract: The invention is directed towards methods, compositions, and apparatus for increasing the strength of paper made out of a furnish having a large proportion of OCC. The method involves the following steps: 1) Providing a paper furnish having a large amount of OCC in it, 2) adding strength promoter to the furnish prior to adding a strength agent to the furnish, 3) adding a strength agent to the furnish, and 4) making a paper product from the furnish. This method allows cheap OCC material to be used in a papermaking process without the quality problems that the anionic trash in OCC typically causes. Thus paper products having low costs and high quality can be produced.
    Type: Application
    Filed: February 17, 2012
    Publication date: May 30, 2013
    Inventors: Yulin ZHAO, Jun LI, Qing Long RAO, Weiguo CHENG
  • Publication number: 20120103548
    Abstract: The invention provides a method of improving dewatering efficiency, increasing sheet wet web strength, increasing sheet wet strength and enhancing filler retention in a papermaking process The method improves the efficiency of drainage aids or wet web strength aids or wet strength aid by coating at least some of the filler particles with a material that prevents the filler materials form adhering to a those additives. The drainage additive or wet web strength additive or wet strength aid holds the cellulose fibers together tightly and is not wasted on the filler particles.
    Type: Application
    Filed: October 13, 2011
    Publication date: May 3, 2012
    Inventors: Yulin ZHAO, Jun LI, Qing Long RAO, Weiguo CHENG
  • Patent number: 8088250
    Abstract: The invention provides a method of producing paper with a higher proportion of mineral filler particles than is otherwise be possible without the expected loss in paper strength. The method allows for the use of the greater amount of filler particles by coating at least some of the filler particles with a material that prevents the filler materials form adhering to a strength additive. The strength additive holds the cellulose fibers together tightly and is not wasted on the filler particles. The method is particularly effective when the filler particles are a PCC-GCC blend and when the GCC particles are coated with the adherence preventing coating.
    Type: Grant
    Filed: November 26, 2008
    Date of Patent: January 3, 2012
    Assignee: Nalco Company
    Inventors: Weiguo Cheng, Jun Li, Yulin Zhao, Qing Long Rao