Patents by Inventor Neelakandan Chandrasekaran

Neelakandan Chandrasekaran 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: 20240042396
    Abstract: A polymeric membrane. The membrane can include a polymeric membrane made from a polymer selected from an aromatic sulfone polymer, polyamide, cellulose, cellulose acetate, polymethylmethacrylate, polyvinylalcohol, and polyacrylnitril, wherein the polymeric membrane has a major surface; a stilbenoid, isoflavone or flavone coated on the major surface of the polymeric membrane.
    Type: Application
    Filed: December 6, 2021
    Publication date: February 8, 2024
    Inventors: Oliver Schuster, Neelakandan Chandrasekaran, Detlef Krieter, Stefan Weuster, Holger Gottschalk
  • Publication number: 20230102306
    Abstract: The method includes unwinding a thermoplastic film from a roll, stretching the thermoplastic film in the machine direction so that it plastically deforms and decreases in width, slitting the stretched thermoplastic film into the multiple mechanical fastening strips, and winding the multiple mechanical fastening strips into multiple rolls. The thermoplastic film has a first surface and a second surface opposite the first surface, and the first surface of the thermoplastic film bears a plurality of male fastening elements. In the method, the unwinding, stretching, slitting, and winding are completed in-line.
    Type: Application
    Filed: June 26, 2018
    Publication date: March 30, 2023
    Inventors: Thomas J. Gilbert, Neelakandan Chandrasekaran, Ryan M. Luepke, Scott M. Niemi
  • Publication number: 20220314576
    Abstract: A composite fabric includes a nonwoven fabric layer having non-bonded areas and a structured film layer discontinuously bonded to the nonwoven fabric layer. The discontinuously bonded nonwoven fabric layer and the structured film layer share an overlapping area with at least one set of coincident bond sites. The discontinuously bonded nonwoven fabric does not have another bonding pattern in the overlapping area distinct from the at least one set of coincident bond sites. A method of forming a composite fabric is also described. The method includes forming a fiber layer including a mat of at least partially unconsolidated fibers, positioning a structured film layer and the fiber layer such that they overlap, and discontinuously bonding the mat into a discontinuously bonded nonwoven fabric while simultaneously bonding the structured film layer to the nonwoven fabric layer. An apparatus for forming a composite fabric is also described.
    Type: Application
    Filed: June 14, 2022
    Publication date: October 6, 2022
    Inventors: Thomas J. Gilbert, Shou-Lu G. Wang, Neelakandan Chandrasekaran, Todd L. Nelson, Stanley Rendon, Mark A. Peltier, Michael R. Berrigan, Jerald W. Hall, JR., Stephen M. Sanocki, Daniel E. Johnson, Bernard G. Rolstad, Ibrahim S. Gunes, Jayant Chakravarty
  • Publication number: 20220079821
    Abstract: The article includes at least a first layer having first and second major surfaces and a second layer adjacent the second major surface of the first layer. The first major surface of the first layer is at least a portion of a visible, outer surface of the article. At least a portion of the first layer is a see-through thermoplastic film that has a first color other than white. The second layer includes a microporous film having an opaque, microporous region and a nonporous region. When the opaque, microporous region and the nonporous region are seen through the first layer, they create an appearance on the outer surface of two different colors or two different shades of the same color. A method of making the article is also described.
    Type: Application
    Filed: December 30, 2019
    Publication date: March 17, 2022
    Inventors: Neelakandan Chandrasekaran, Scott M. Niemi, Thomas J. Gilbert, Shannon R.A. Harnden
  • Publication number: 20210378367
    Abstract: The composite elastic material (22) includes an elastic layer (4) and a structured film layer (15) having first and second opposing surfaces, with the second surface bonded to the elastic layer (4). The first surface of the structured film layer (15) has upstanding male fastening elements. The structured film layer (15) is gathered such that the upstanding male fastening elements point in multiple directions. The composite elastic material (22) can also be called a stretch-bonded laminate, which include an elastic layer (4) stretch-bonded to a second surface of a structured film layer (15). A first surface of the structured film layer (15), opposite the second surface, has upstanding male fastening elements. A process for making the composite elastic material (22) is also described. An absorbent article including the composite elastic material (22) is also described.
    Type: Application
    Filed: October 8, 2019
    Publication date: December 9, 2021
    Inventors: Thomas J. Gilbert, Todd L. Nelson, Neelakandan Chandrasekaran, Mark A. Peltier, Scott M. Niemi, Stanley Rendon
  • Patent number: 11020949
    Abstract: The method of making a laminate (100) includes stretching a thermoplastic layer (102) so that it plastically deforms, relaxing the plastically deformed thermoplastic layer (102) to reduce its tensile strain, and subsequently laminating the thermoplastic layer (102) to a substrate (104) to make the laminate (100). The stretching, relaxing, and laminating are completed in-line. The thermoplastic layer has a first surface and a second surface opposite the first surface, with the first surface of the thermoplastic layer bearing a plurality of male fastening elements. The second surface of the thermoplastic layer (100) is laminated to the substrate (104).
    Type: Grant
    Filed: December 19, 2016
    Date of Patent: June 1, 2021
    Assignee: 3M Innovative Properties Company
    Inventors: Thomas J. Gilbert, Neelakandan Chandrasekaran, Todd L. Nelson, Michael R. Gorman, Mark A. Peltier
  • Patent number: 10967624
    Abstract: The article includes a thermoplastic layer having opposing first and second side edges and a first surface bearing male fastening elements. The thermoplastic layer is plastically deformed and has a retardance profile having an average retardance along a line from the first edge to a location 500 micrometers from the first edge and a distance from the first edge where 75% of the average retardance is observed of at least 10 micrometers. In some cases, a distance between the first and second side edges is up to 50 millimeters. In some cases, the article is a fastening tab. The method includes providing a thermoplastic film having opposing first and second side edges, with a distance between the opposing side edges of up to 50 millimeters, and stretching the thermoplastic film to form the thermoplastic layer, which is plastically deformed. The first surface of the thermoplastic film bears male fastening elements.
    Type: Grant
    Filed: December 19, 2016
    Date of Patent: April 6, 2021
    Assignee: 3M Innovative Properties Company
    Inventors: Thomas J. Gilbert, Todd L. Nelson, Neelakandan Chandrasekaran, Steven J. Perron, Timothy P. Pariseau, Mark A. Peltier
  • Patent number: 10709619
    Abstract: A fastening tape, mechanical fastener, methods of making them, and personal hygiene articles including them are disclosed. The fastening tape includes a tape backing having a fastening portion, an adhesive disposed on the fastening portion, and a release surface for the adhesive. The release surface is a either a release tape attached along one of its edges to the tape backing or a release coating disposed on at least a portion of a surface of the tape backing. At least one of the tape backing or the release surface comprises a microporous film having an opaque, microporous region and at least one see-through region of lower porosity within the opaque, microporous region. The mechanical fastener includes such a microporous film and mechanical fastening elements on at least one surface. The at least one see-through region extends through the thickness of the microporous film.
    Type: Grant
    Filed: June 12, 2014
    Date of Patent: July 14, 2020
    Assignee: 3M Innovative Properties Company
    Inventors: Neelakandan Chandrasekaran, Robert L. W. Smithson, Timothy V. Stagg
  • Patent number: 10704172
    Abstract: A multi-component fiber including at least first and second components. In some cases, at least a portion of the first component is opaque and microporous, and the second component is different from the first component. In some cases, at least a portion of the second component can be seen through at least a portion of the first component. A fiber having an opaque, microporous region and a see-through region of lower porosity is also disclosed. Fibrous webs including such fibers are also disclosed. In some cases, the fibrous web has at least one first region where first portions of the multiple fibers are opaque and microporous and at least one second region where second portions of the multiple fibers form a see-through region of lower porosity. Articles and laminates including the fibrous webs are disclosed. Methods of making the fibers, fibrous webs, and articles are also disclosed.
    Type: Grant
    Filed: April 10, 2015
    Date of Patent: July 7, 2020
    Assignee: 3M Innovative Properties Company
    Inventors: Neelakandan Chandrasekaran, Lori-Ann S. Prioleau, Leigh E. Wood, Jayant Chakravarty, Timothy V. Stagg
  • Publication number: 20200139612
    Abstract: The method includes stretching a thermoplastic layer so that it plastically deforms and decreases in width and subsequently laminating the thermoplastic layer to a substrate to make the laminate. The stretching and laminating are completed in-line. The thermoplastic layer has a first surface and a second surface opposite the first surface, with the first surface of the thermoplastic layer bearing a plurality of male fastening elements. The second surface of the thermoplastic layer is laminated to the substrate. In some cases, the thermoplastic layer decreases in width by at least 25 percent, and after the stretching, the thermoplastic layer has a width of up to 60 millimeters. In some cases, stretching is carried out by first and second rolls, and the second roll is faster than the first roll. The thermoplastic layer is typically not directed onto a third roll slower than the second roll before laminating.
    Type: Application
    Filed: June 26, 2018
    Publication date: May 7, 2020
    Inventors: Thomas J. Gilbert, Neelakandan Chandrasekaran, Ryan M. Luepke, Scott M. Niemi, Todd L. Nelson, Mark A. Peltier
  • Patent number: 10518519
    Abstract: A laminate of an at least partially reticulated thermoplastic film joined to an extensible carrier. The reticulated thermoplastic film includes a backing with openings and discrete elements protruding from the first major surface. There are two discrete elements aligned in a first direction abutting opposite ends of any given opening. In a second direction perpendicular to the first direction, there is one discrete element between the given opening and an adjacent opening aligned in the second direction. Each portion of the thermoplastic backing around the given opening is plastically deformed in its lengthwise direction. A method of making a laminate is also disclosed. The method includes stretching a thermoplastic backing having a plurality of discrete elements in the first direction and laminating the backing to an extensible carrier. Subsequently stretching the laminate in a second direction forms a tear in the thermoplastic backing between two adjacent of the discrete elements.
    Type: Grant
    Filed: May 10, 2017
    Date of Patent: December 31, 2019
    Assignee: 3M Innovative Properties Company
    Inventors: Neelakandan Chandrasekaran, Thomas P. Hanschen, Timothy P. Pariseau
  • Patent number: 10427365
    Abstract: A principal film comprising a first polymeric component wherein the principal film has: (1) first and second major faces; (2) a land portion wherein the principal film is capable of thermally-induced self-forming; and (3) one or more modification zones, each comprising a central portion and a rim portion surrounding the central portion and being surrounded by land portion, wherein the average thickness of each rim portion is greater than the average thickness of the land portion surrounding the modification zone, the average thickness of each central portion is less than the average thickness of the land portion surrounding the modification zone and is greater than zero. Also methods for making such films and articles comprising such films.
    Type: Grant
    Filed: December 23, 2015
    Date of Patent: October 1, 2019
    Assignee: 3M Innovative Properties Company
    Inventors: Patrick J. Hager, Mark A. Strobel, Joel A. Getschel, Shujun J. Wang, Adam O. Moughton, Neelakandan Chandrasekaran
  • Patent number: 10376420
    Abstract: A personal hygiene article includes a chassis with a topsheet, a backsheet, and an absorbent component between the topsheet and the backsheet. At least one portion of the personal hygiene article includes a microporous film having an opaque, microporous region and at least one see-through region of lower porosity within the opaque, microporous region. The microporous film can include a beta-nucleating agent or can have thermally induced phase separation caused by a diluent. A container includes a microporous film enclosing at least one personal hygiene article. The microporous film has an opaque, microporous region and at least one see-through region of lower porosity forming a window within the opaque, microporous region. Methods of making the personal hygiene article and container are also described.
    Type: Grant
    Filed: June 12, 2014
    Date of Patent: August 13, 2019
    Assignee: 3M Innovative Properties Company
    Inventors: Neelakandan Chandrasekaran, Robert L. W. Smithson, Leigh E. Wood, Timothy V. Stagg
  • Publication number: 20190001653
    Abstract: The method of making a laminate (100) includes stretching a thermoplastic layer (102) so that it plastically deforms, relaxing the plastically deformed thermoplastic layer (102) to reduce its tensile strain, and subsequently laminating the thermoplastic layer (102) to a substrate (104) to make the laminate (100). The stretching, relaxing, and laminating are completed in-line. The thermoplastic layer has a first surface and a second surface opposite the first surface, with the first surface of the thermoplastic layer bearing a plurality of male fastening elements. The second surface of the thermoplastic layer (100) is laminated to the substrate (104).
    Type: Application
    Filed: December 19, 2016
    Publication date: January 3, 2019
    Inventors: Thomas J. Gilbert, Neelakandan Chandrasekaran, Todd L. Nelson, Michael R. Gorman, Mark A. Peltier
  • Patent number: 10165833
    Abstract: A mechanical fastener is disclosed that includes a thermoplastic backing and multiple, upstanding fastening elements that have a post with a proximal end attached to the thermoplastic backing and a distal end comprising a cap larger in area than a cross-sectional area of the post. The basis weight of the mechanical fastener is in a range from 25 grams per square meter to 75 grams per square meter, and the height of the multiple, upstanding fastening elements is up to 300 micrometers. Fastening systems and disposable absorbent articles including the mechanical fastener are also disclosed.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: January 1, 2019
    Assignee: 3M Innovative Properties Company
    Inventors: Timothy P. Pariseau, Michael R. Gorman, Shin Katoh, Tadato Oritani, Zhiqun Zhang, Neelakandan Chandrasekaran
  • Publication number: 20180368535
    Abstract: The article includes a thermoplastic layer having opposing first and second side edges and a first surface bearing male fastening elements. The thermoplastic layer is plastically deformed and has a retardance profile having an average retardance along a line from the first edge to a location 500 micrometers from the first edge and a distance from the first edge where 75% of the average retardance is observed of at least 10 micrometers. In some cases, a distance between the first and second side edges is up to 50 millimeters. In some cases, the article is a fastening tab. The method includes providing a thermoplastic film having opposing first and second side edges, with a distance between the opposing side edges of up to 50 millimeters, and stretching the thermoplastic film to form the thermoplastic layer, which is plastically deformed. The first surface of the thermoplastic film bears male fastening elements.
    Type: Application
    Filed: December 19, 2016
    Publication date: December 27, 2018
    Applicant: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Thomas J. Gilbert, Todd L. Nelson, Neelakandan Chandrasekaran, Steven J. Perron, Timothy P. Pariseau, Mark A. Peltier
  • Patent number: 10076450
    Abstract: A structured film of a semi-crystalline polyolefin and a beta-nucleating agent is disclosed. The structured film has a backing and upstanding posts attached to the backing. At least a portion of the film typically includes beta-spherulites. In some embodiments, the backing is microporous while the upstanding posts have lower porosity. A method of making a structured film is also disclosed. The method includes extruding a melt of a polyolefin and a beta-nucleating agent in the presence of a tool to provide the structured film having upstanding posts on a backing and cooling at least a portion of the structured film to a temperature sufficient to form beta-spherulites. In some embodiments, the method further includes stretching the structured film containing beta-spherulites to provide micropores in the backing.
    Type: Grant
    Filed: June 6, 2016
    Date of Patent: September 18, 2018
    Assignee: 3M Innovative Properties Company
    Inventor: Neelakandan Chandrasekaran
  • Publication number: 20180222143
    Abstract: A composite fabric includes a nonwoven fabric layer having non-bonded areas and a structured film layer discontinuously bonded to the nonwoven fabric layer. The discontinuously bonded nonwoven fabric layer and the structured film layer share an overlapping area with at least one set of coincident bond sites. The discontinuously bonded nonwoven fabric does not have another bonding pattern in the overlapping area distinct from the at least one set of coincident bond sites. A method of forming a composite fabric is also described. The method includes forming a fiber layer including a mat of at least partially unconsolidated fibers, positioning a structured film layer and the fiber layer such that they overlap, and discontinuously bonding the mat into a discontinuously bonded nonwoven fabric while simultaneously bonding the structured film layer to the nonwoven fabric layer. An apparatus for forming a composite fabric is also described.
    Type: Application
    Filed: August 10, 2016
    Publication date: August 9, 2018
    Inventors: Thomas J. Gilbert, Shou-Lu G. Wang, Neelakandan Chandrasekaran, Todd L. Nelson, Stanley Rendon, Mark A. Peltier, Michael R. Berrigan, Jerald W. Hall, Jr., Stephen M. Sanocki, Daniel E. Johnson, Bernard G. Rolstad, Ibrahim S. Gunes, Jayant Chakravarty
  • Patent number: 9944764
    Abstract: A reticulated thermoplastic film includes a backing with openings and discrete elements protruding from the first major surface. There are two discrete elements aligned in a first direction abutting opposite ends of any given opening. In a second direction perpendicular to the first direction, there is one discrete element between the given opening and an adjacent opening aligned in the second direction. Each portion of the backing around the given opening is plastically deformed in its lengthwise direction and typically has higher stretch-induced molecular orientation at its edge adjacent the given opening than at its midpoint. The openings are often retractable. A method of making a reticulated thermoplastic film is also disclosed. The method includes stretching a thermoplastic backing with a plurality of discrete elements in the first direction. Subsequently stretching the backing in the second direction forms a tear in the backing between two adjacent discrete elements.
    Type: Grant
    Filed: May 23, 2013
    Date of Patent: April 17, 2018
    Assignee: 3M Innovative Properties Company
    Inventors: Neelakandan Chandrasekaran, Thomas P. Hanschen, Timothy P. Pariseau, William C. Unruh
  • Publication number: 20170361550
    Abstract: A principal film comprising a first polymeric component wherein the principal film has: (1) first and second major faces; (2) a land portion wherein the principal film is capable of thermally-induced self- forming; and (3) one or more modification zones, each comprising a central portion and a rim portion surrounding the central portion and being surrounded by land portion, wherein the average thickness of each rim portion is greater than the average thickness of the land portion surrounding the modification zone, the average thickness of each central portion is less than the average thickness of the land portion surrounding the modification zone and is greater than zero. Also methods for making such films and articles comprising such films.
    Type: Application
    Filed: December 23, 2015
    Publication date: December 21, 2017
    Inventors: Patrick J. Hager, Mark A. Strobel, Joel A. Getschel, Shujun J. Wang, Adam O. Moughton, Neelakandan Chandrasekaran