Patents by Inventor Angel Stoyanov

Angel Stoyanov 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).

  • Publication number: 20150321171
    Abstract: Absorbent articles comprising bleached polycrylic acid crosslinked cellulose fibers with reduced furfural content are disclosed. The reduced furfural content is accompanied by a strong reduction of malodor associated with crosslinked fibers. Methods of furfural reduction include treatment with hydrogen peroxide in the absence of alkaline or other bleaching agents subsequent to curing polyacrylic acid crosslinked cellulose fibers. Some embodiments of treated polycrylic acid crosslinked cellulose fibers have a furfural content lower than 1.3 ppm. In some embodiments, the reduction of furfural content of the treated crosslinked fibers compared to untreated crosslinked fibers is at least 55%. In some embodiments, furfural content decreases with aging of the treated crosslinked fibers.
    Type: Application
    Filed: May 6, 2014
    Publication date: November 12, 2015
    Applicant: The Procter & Gamble Company
    Inventors: Jorg ENDRES, Holger Beruda, Ludwig Busam, Angel Stoyanov
  • Patent number: 8722797
    Abstract: A crosslinked cellulose fiber that has been crosslinked with a low molecular weight polyacrylic acid crosslinking agent, having phosphorous incorporated into the polymer chain and a method of crosslinking the fiber.
    Type: Grant
    Filed: September 29, 2009
    Date of Patent: May 13, 2014
    Assignee: Weyerhaeuser NR Company
    Inventors: Angel Stoyanov, Charles E. Miller
  • Patent number: 8475631
    Abstract: The process of making crosslinked cellulose pulp fiber comprising plasma treating a sheet of cellulose pulp fiber before the sheet is impregnated with a crosslinking formulation which comprises a crosslinking agent and a catalyst, then defiberizing the treated cellulose pulp sheet to form treated defiberized cellulose pulp, then heating and curing the treated defiberized cellulose pulp to form intrafiber crosslinked cellulose pulp fibers.
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: July 2, 2013
    Assignee: Wyerhauser NR Company
    Inventors: Angel Stoyanov, Charles E. Miller
  • Publication number: 20120000618
    Abstract: The process of making crosslinked cellulose pulp fiber comprising plasma treating a sheet of cellulose pulp fiber before the sheet is impregnated with a crosslinking formulation which comprises a crosslinking agent and a catalyst, then defiberizing the treated cellulose pulp sheet to form treated defiberized cellulose pulp, then heating and curing the treated defiberized cellulose pulp to form intrafiber crosslinked cellulose pulp fibers.
    Type: Application
    Filed: June 30, 2010
    Publication date: January 5, 2012
    Applicant: WEYERHAEUSER NR COMPANY
    Inventors: ANGEL STOYANOV, CHARLES E. MILLER
  • Publication number: 20120004406
    Abstract: An intrafiber crosslinked cellulose pulp fiber manufactured from plasma-treated pulp sheet. The crosslinked fiber can have lower sonic knots than an untreated pulp sheet.
    Type: Application
    Filed: June 30, 2010
    Publication date: January 5, 2012
    Applicant: WEYERHAEUSER NR COMPANY
    Inventors: ANGEL STOYANOV, CHARLES E. MILLER
  • Publication number: 20110077354
    Abstract: A crosslinked cellulose fiber that has been crosslinked with a low molecular weight polyacrylic acid crosslinking agent, having phosphorous incorporated into the polymer chain and a method of crosslinking the fiber.
    Type: Application
    Filed: September 29, 2009
    Publication date: March 31, 2011
    Applicant: Weyerhaeuser NR Company
    Inventors: Angel Stoyanov, Charles E. Miller
  • Patent number: 7513973
    Abstract: Bleached polyacrylic acid crosslinked cellulosic fibers, methods for making the fibers, and products including the fibers. The bleached polyacrylic acid crosslinked cellulosic fibers are polyacrylic acid crosslinked cellulosic fibers that have been treated with one or more bleaching agents to provide crosslinked cellulosic fibers having improved whiteness.
    Type: Grant
    Filed: March 31, 2004
    Date of Patent: April 7, 2009
    Assignee: Weyerhaeuser NR Company
    Inventors: Angel Stoyanov, R. Scott Stephens, Shahrokh A. Naieni
  • Patent number: 6986793
    Abstract: A method for making bleached crosslinked cellulosic fibers having high color and brightness properties is disclosed. In the method cellulosic fibers which have been with a crosslinking agent in the presence of a polyol are treated with a bleaching agent to yield cellulosic fibers with high color and brightness.
    Type: Grant
    Filed: March 31, 2004
    Date of Patent: January 17, 2006
    Assignee: Weyerhaeuser Company
    Inventors: Angel Stoyanov, Shahrokh A. Naieni
  • Publication number: 20050223501
    Abstract: A method for making bleached crosslinked cellulosic fibers having high color and brightness properties is disclosed. In the method cellulosic fibers which have been with a crosslinking agent in the presence of a polyol are treated with a bleaching agent to yield cellulosic fibers with high color and brightness.
    Type: Application
    Filed: March 31, 2004
    Publication date: October 13, 2005
    Inventors: Angel Stoyanov, Shahrokh Naieni
  • Publication number: 20050217812
    Abstract: Cellulose fibers are crosslinked with a crosslinking agent in the presence of a polyol, the cured fibers are then treated with a bleaching agent to give crosslinked fibers with high color and brightness.
    Type: Application
    Filed: March 31, 2004
    Publication date: October 6, 2005
    Inventors: Angel Stoyanov, Shahrokh Naieni
  • Publication number: 20050217810
    Abstract: Bleached polyacrylic acid crosslinked cellulosic fibers, methods for making the fibers, and products including the fibers.
    Type: Application
    Filed: March 31, 2004
    Publication date: October 6, 2005
    Inventors: Angel Stoyanov, R. Stephens, Shahrokh Naieni
  • Publication number: 20050145350
    Abstract: Individualized intrafiber crosslinked cellulosic fibers having improved color properties and brightness are disclosed.
    Type: Application
    Filed: December 30, 2003
    Publication date: July 7, 2005
    Inventors: Angel Stoyanov, Shahrokh Naieni, David Unran
  • Publication number: 20050148966
    Abstract: An absorbent product is described in which cellulosic fibers are reacted with an effective amount of a crosslinking agent in the presence of an effective amount of a C4-C12 polyol. The individualized intrafiber crosslinked cellulosic fibers are characterized by a Whiteness Index, (WICDM-L) greater than about 69. The crosslinked fibers can be incorporated into infant diapers, adult incontinent products, feminine hygiene products and paperboard products.
    Type: Application
    Filed: December 30, 2003
    Publication date: July 7, 2005
    Inventors: Angel Stoyanov, Shahrokh Naieni, David Unrau
  • Publication number: 20050143571
    Abstract: A method for forming individualized intrafiber crosslinked cellulosic fibers with improved color and brightness properties.
    Type: Application
    Filed: December 30, 2003
    Publication date: June 30, 2005
    Inventors: Angel Stoyanov, Shahrokh Naieni, David Unrau
  • Publication number: 20050019569
    Abstract: Glyoxal crosslinked cellulosic fibers having improved brightness and color, and methods for making the fibers.
    Type: Application
    Filed: July 25, 2003
    Publication date: January 27, 2005
    Inventors: Angel Stoyanov, Shahrokh Naieni, R. Stephens
  • Publication number: 20050019563
    Abstract: Glyoxal crosslinked cellulosic fibers having high wet bulk, and methods for making the fibers.
    Type: Application
    Filed: July 25, 2003
    Publication date: January 27, 2005
    Inventors: Angel Stoyanov, Shahrokh Naieni
  • Publication number: 20050016699
    Abstract: Glyoxal crosslinked cellulosic fibers having high wet bulk, and methods for making the fibers.
    Type: Application
    Filed: July 25, 2003
    Publication date: January 27, 2005
    Inventors: Angel Stoyanov, Shahrokh Naieni
  • Publication number: 20050016698
    Abstract: Glyoxal crosslinked cellulosic fibers having improved brightness and color, and methods for making the fibers.
    Type: Application
    Filed: July 25, 2003
    Publication date: January 27, 2005
    Inventors: Angel Stoyanov, Shahrokh Naieni, R. Stephens