Patents by Inventor Justin L. Keough

Justin L. Keough 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).

  • Processing aids for olefinic webs, including electret webs
    Patent number: 9284669
    Abstract: Methods of preparing polymeric webs include hot melt blending of thermoplastic resins and processing aids. The process aids include hindered amine N-substituted succinimide oligomers. The webs prepared from the blends may be in the form of films or non-woven fibrous webs. Non-woven microfiber webs are useful as filtration media. Among the polymeric webs produced are electret webs. The processing aids also function as charge-enhancing additives for the electret webs.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: March 15, 2016
    Assignee: 3M Innovative Properties Company
    Inventors: Fuming B. Li, John M. Sebastian, Marvin E. Jones, John M. Brandner, David A. Olson, Justin L. Keough
  • PROCESSING AIDS FOR OLEFINIC WEBS, INCLUDING ELECTRET WEBS
    Publication number: 20120090614
    Abstract: Methods of preparing polymeric webs include hot melt blending of thermoplastic resins and processing aids. The process aids include hindered amine N-substituted succinimide oligomers. The webs prepared from the blends may be in the form of films or non-woven fibrous webs. Non-woven microfiber webs are useful as filtration media. Among the polymeric webs produced are electret webs. The processing aids also function as charge-enhancing additives for the electret webs.
    Type: Application
    Filed: March 30, 2010
    Publication date: April 19, 2012
    Inventors: Fuming B. Li, John M. Sebastian, Marvin E. Jones, John M. Brandner, David A. Olson, Justin L. Keough
  • Method of making electret articles based on zeta potential
    Patent number: 7765698
    Abstract: A method of making an electret article, from a polymeric article that has a zeta potential of greater than or less than ?7.5 millivolts. The article is charged by contacting it with an aqueous liquid that has a pH and conductivity as follows: (i) if the article has a zeta potential of ?7.5 mV or less, then the contacting liquid has pH greater than 7 and a conductivity of 5 to 9,000 microSiemens per centimeter; and (ii) if the article has a zeta potential of greater than ?7.5 mV, then the contacting liquid has a pH of 7 or less and a conductivity of 5 to 5,500 microSiemens per centimeter. An electret article made in this manner can provide improved electret performance, particularly in electret filtration articles.
    Type: Grant
    Filed: June 2, 2008
    Date of Patent: August 3, 2010
    Assignee: 3M Innovative Properties Company
    Inventors: John M. Sebastian, Marvin E. Jones, Fuming B. Li, Shih-Hung Chou, Nathan E. Schultz, Justin L. Keough, Rahul R. Shah, Daniel A. Japuntich
  • METHOD OF MAKING ELECTRET ARTICLES BASED ON ZETA POTENTIAL
    Publication number: 20090293279
    Abstract: A method of making an electret article, from a polymeric article that has a zeta potential of greater than or less than ?7.5 millivolts. The article is charged by contacting it with an aqueous liquid that has a pH and conductivity as follows: (i) if the article has a zeta potential of ?7.5 mV or less, then the contacting liquid has pH greater than 7 and a conductivity of 5 to 9,000 microSiemens per centimeter; and (ii) if the article has a zeta potential of greater than ?7.5 mV, then the contacting liquid has a pH of 7 or less and a conductivity of 5 to 5,500 microSiemens per centimeter. An electret article made in this manner can provide improved electret performance, particularly in electret filtration articles.
    Type: Application
    Filed: June 2, 2008
    Publication date: December 3, 2009
    Inventors: John M. Sebastian, Marvin E. Jones, Fuming Bruce Li, Shih-Hung Chou, Nathan E. Schultz, Justin L. Keough, Rahul R. Shah, Daniel A. Japuntich