Patents by Inventor Saswata Chakraborty

Saswata Chakraborty 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: 11312100
    Abstract: Article comprising a first microstructured layer comprising a first material, and having first and second opposed major surfaces, the first major surface being a microstructured surface, and the microstructured surface having peaks and valleys, wherein the peaks are microstructural features each having a height defined by the distance between the peak of the respective microstructural feature and an adjacent valley; and a second layer comprising an adhesive material, and having a first and second opposed major surfaces, the adhesive material comprising a reaction product of a mixture comprising (meth)acrylate and epoxy in the presence of each other, wherein at least a portion of the second major surface of the second layer is directly attached to at least a portion of the first major microstructured surface of the first layer.
    Type: Grant
    Filed: December 22, 2016
    Date of Patent: April 26, 2022
    Assignee: 3M Innovative Properties Company
    Inventors: Jeffrey L. Solomon, Saswata Chakraborty, Robert J. Devoe, Wayne S. Mahoney, Eric W. Nelson, Kundapur Raveesh Shenoy
  • Publication number: 20220056258
    Abstract: In one embodiment, an orthodontic article is described comprising the reaction product of a polymerizable composition comprising: a) 30-70 parts by weight of monofunctional (meth)acrylate monomer, wherein a cured homopolymer of at least one monofunctional (meth)acrylate monomer has a Tg of at least 30, 35, 40, 45, 50, 55, or 60° C.; and b) urethane (meth)acrylate polymer comprising polymerized units of an aliphatic polyester diol. Also described are polymerizable compositions, as well as methods and systems for making an article utilizing 3D printing.
    Type: Application
    Filed: October 31, 2019
    Publication date: February 24, 2022
    Inventors: Thomas P. Klun, Richard J. Pokorny, Chad M. Amb, Benjamin R. Coonce, Tianyu Wu, Saswata Chakraborty, Yongshang Lu, Benjamin C. Mac Murray, Robert S. Clough, Ahmed S. Abuelyaman, John M. Riedesel
  • Publication number: 20220023007
    Abstract: The present disclosure provides a method of making an orthodontic article. The method includes (a) providing a photopolymerizable composition; (b) selectively curing the photopolymerizable composition using actinic radiation to form an article in the shape of an orthodontic article including a number of layers of at least one photopolymerized polymer; and (c) moving the article and thereby generating a mass inertial force in the uncured photopolymerizable composition. The article has a first surface, and no more than 75% of the first surface has a slope magnitude greater than 2.5 degrees. Orthodontic articles are also provided, including an orthodontic article that is prepared according to the method. Orthodontic articles having low extractable component content are further provided. The mass inertial force tends to form a coating layer of uncured photopolymerizable composition on the article, and curing the coating layer can form a surface having low slope magnitude.
    Type: Application
    Filed: January 21, 2020
    Publication date: January 27, 2022
    Inventors: Saswata Chakraborty, Benjamin C. Mac Murray, James D. Hansen, Karl J.L. Geisler, Thomas P. Klun, Daniel J. Skamser, John M. Riedesel, Steven H. Kong, Anja Friedrich
  • Patent number: 11225535
    Abstract: The present disclosure provides a photopolymerizable composition. The photopolymerizable composition includes a) 40-60 parts by weight of a monofunctional (meth)acrylate monomer, per 100 parts of the total photopolymerizable composition; b) a photoinitiator; and c) a polymerization reaction product of components. A cured homopolymer of the monofunctional (meth)acrylate monomer has a glass transition temperature of 125 degrees Celsius or greater. The polymerization reaction product of components includes i) a diisocyanate; ii) a hydroxy functional methacrylate; iii) a polycarbonate diol; and iv) a catalyst. The polymerization reaction product includes a polyurethane methacrylate polymer.
    Type: Grant
    Filed: May 21, 2019
    Date of Patent: January 18, 2022
    Assignee: 3M Innovative Properties Company
    Inventors: Thomas P. Klun, Zeba Parkar, John M. Riedesel, Richard J. Pokorny, Chad M. Amb, Benjamin R. Coonce, Robert S. Clough, Tianyu Wu, Saswata Chakraborty, Yongshang Lu, Benjamin C. MacMurray, Ian Dailey, David B. Olson
  • Publication number: 20210386522
    Abstract: An orthodontic article is described comprising a cured composition comprising the reaction product of free-radically polymerizable resin comprising at least one monomer, oligomer and/or polymer, comprising at least two (meth)acryl moieties; a monofunctional reactive diluent; and a polymer or macromolecule comprising a free-radical photoinitiator group. The polymer or macromolecule has a molecular weight of at least 500 g/mole. In one embodiment, the cured composition comprises a first and second photoinitiator wherein at least one is a polymer or macromolecule. Also described are photopolymerizable compositions and methods.
    Type: Application
    Filed: November 20, 2018
    Publication date: December 16, 2021
    Inventors: Saswata Chakraborty, Benjamin C. Mac Murray, Eric W. Nelson, Thomas P. Klun, Wayne S. Mahoney, Chad M. Amb, George W. Griesgraber, Dana R. Reed, Ahmed S. Abuelyaman, Robert S. Clough, James D. Hansen, Daniel J. Skamser, Ian Dailey, John M. Riedesel
  • Publication number: 20210361389
    Abstract: The present disclosure provides methods of making a hydrated orthodontic article is provided. One method includes a) providing a photopolymerizable composition; b) selectively curing the photopolymerizable composition using actinic radiation to form an article in the shape of an orthodontic article having a plurality of layers of at least one photopolymerized polymer; and c) exposing the article to water by submersion in water, thereby hydrating the article. A sheet of the at least one photopolymerized polymer has a bending modulus when hydrated of 100 MPa or greater and 2200 MPa or less. Another method includes exposing the orthodontic article to water vapor and hermetically sealing the hydrated orthodontic article in a container. Hydrated orthodontic articles are also provided, including an orthodontic article that is prepared according to one of the methods.
    Type: Application
    Filed: June 25, 2019
    Publication date: November 25, 2021
    Inventors: Benjamin C. Mac Murray, Saswata Chakraborty, John M. Riedesel, Thomas P. Klun, Chad M. Amb, Karl J.L. Geisler, Zeba Parkar, Adrian S. Eckert, Mark T. Gibson, Tianyu Wu
  • Patent number: 11149194
    Abstract: The present disclosure provides a composite particle that includes: a fluorescent semiconductor core/shell nanoparticle (preferably, nanocrystal); and a stabilizing homo- or copolymer combined with the core/shell nanoparticle, the stabilizing (co)polymer comprising styrene monomer units and functionalized with phosphine, arsine or stibine groups.
    Type: Grant
    Filed: July 18, 2017
    Date of Patent: October 19, 2021
    Assignee: 3M Innovative Properties Company
    Inventors: Carl A. Laskowski, Saswata Chakraborty, Wayne S. Mahoney, Guy D. Joly, Michael C. Palazzotto
  • Publication number: 20210301042
    Abstract: The present disclosure provides a photopolymerizable composition. The photopolymerizable composition includes a) 40-60 parts by weight of a monofunctional (meth)acrylate monomer, per 100 parts of the total photopolymerizable composition; b) a photoinitiator; and c) a polymerization reaction product of components. A cured homopolymer of the monofunctional (meth)acrylate monomer has a glass transition temperature of 125 degrees Celsius or greater. The polymerization reaction product of components includes i) a diisocyanate; ii) a hydroxy functional methacrylate; iii) a polycarbonate diol; and iv) a catalyst. The polymerization reaction product includes a polyurethane methacrylate polymer.
    Type: Application
    Filed: June 10, 2021
    Publication date: September 30, 2021
    Inventors: Thomas P. Klun, Zeba Parkar, John M. Riedesel, Richard J. Pokorny, Chad M. Amb, Benjamin R. Coonce, Robert S. Clough, Tianyu Wu, Saswata Chakraborty, Yongshang Lu, Benjamin C. Mac Murray
  • Publication number: 20210292458
    Abstract: A composition is described comprising a styrene-isobutylene block copolymer; and at least one ethylenically unsaturated monomer. After curing the composition comprises polymerized units of the ethylenically unsaturated monomer. In some embodiments the ethylenically unsaturated groups are selected from (meth)acryl or vinyl ether. The composition is suitable for use as a (e.g. pressure sensitive) adhesive. Articles, methods of making an article, and methods of bonding are also described.
    Type: Application
    Filed: July 8, 2019
    Publication date: September 23, 2021
    Inventors: Vasav Sahni, Saswata Chakraborty, Wayne S. Mahoney, Jason D. Clapper, Jacob P. Johnson, Ying Zhang, Albert I. Everaerts, Bryan V. Hunt, Richard B. Ross
  • Patent number: 11104758
    Abstract: The present disclosure provides an orthodontic article including the reaction product of the photopolymerizable composition. The photopolymerizable composition includes i) a monofunctional (meth)acrylate monomer whose cured homopolymer has a glass transition temperature of 90 degrees Celsius or greater; ii) a photoinitiator; and iii) a polymerization reaction product of components. The components include 1) an isocyanate; 2) a (meth)acrylate mono-ol; 3) a polycarbonate diol; and 4) a catalyst. Further, the present disclosure provides a method of making an orthodontic article. The method includes obtaining a photopolymerizable composition and selectively curing the photopolymerizable composition to form an orthodontic article.
    Type: Grant
    Filed: May 21, 2019
    Date of Patent: August 31, 2021
    Assignee: 3M Innovative Properties Company
    Inventors: Thomas P. Klun, Zeba Parkar, John M. Riedesel, Richard J. Pokorny, Chad M. Amb, Benjamin R. Coonce, Robert S. Clough, Tianyu Wu, Saswata Chakraborty, Yongshang Lu, Benjamin C. MacMurray, Ian Dailey, David B. Olson
  • Publication number: 20210238328
    Abstract: Orthodontic articles and polymerizable resin compositions are described. The orthodontic article comprises a cured composition comprising the reaction product of free-radically polymerizable resin comprising 30 to 70 wt. %, inclusive, of at least one urethane component, and 25 to 70 wt. %, inclusive, of reactive diluent(s) comprising at least one monofunctional (meth)acrylate monomer. The polymerizable resin comprises no greater than 35 wt. % of reactive diluent(s) having a high affinity for water. Reactive diluent(s) such as monofunctional (meth)acrylate monomers having a high affinity for water have low log P values. In one embodiment, the polymerizable resin comprises at least one acidic monomer.
    Type: Application
    Filed: June 26, 2019
    Publication date: August 5, 2021
    Inventors: Tianyu Wu, Saswata Chakraborty, Benjamin C. Mac Murray, Richard J. Pokorny, Thomas P. Klun, Wayne S. Mahoney, Chad M. Amb, Ahmed S. Abuelyaman, Robert S. Clough, John M. Riedesel, James D. Hansen, Ian Dailey, Daniel J. Skamser, Eric W. Nelson, George W. Griesgraber, Dana R. Reed
  • Publication number: 20210186820
    Abstract: An orthodontic article is described comprising the reaction product of a free-radically polymerizable resin; a first free-radical photoinitiator having sufficient absorbance at a first wavelength range; and a second free-radical initiator selected from a second photoinitiator having sufficient absorbance at a second wavelength range, wherein the second wavelength range is different than the first wavelength range, or a thermal free-radical initiator. In some embodiments, a 1 g/liter acetonitrile solution, at a pathlength of 1 cm, has an absorbance of greater than 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, or 0.10 at a wavelength of the first wavelength range when measured with a spectrophotometer. In some embodiments, the first free-radical photoinitiator exhibits a maximum absorbance at a wavelength of the range of 370-380 nm or 320-330 nm and/or comprises photoinitiator groups selected from acyl phosphine oxide or alkyl amine acetophenone.
    Type: Application
    Filed: November 20, 2018
    Publication date: June 24, 2021
    Inventors: Saswata Chakraborty, Benjamin C. Mac Murray, Eric W. Nelson, Thomas P. Klun, Richard J. Pokorny, Wayne S. Mahoney, Chad M. Amb, George W. Griesgraber, Dana R. Reed, Ahmed S. Abuelyaman, Robert S. Clough, James D. Hansen, Daniel J. Skamser, Ian Dailey, John M. Riedesel
  • Publication number: 20210171701
    Abstract: The present disclosure provides an orthodontic article including the reaction product of the polymerizable composition. Further, the present disclosure provides polymerizable compositions and methods of making an orthodontic article. The method includes obtaining a polymerizable composition and selectively curing the polymerizable composition to form an orthodontic article. Further, methods are provided, including receiving, by a manufacturing device having one or more processors, a digital object comprising data specifying an orthodontic article; and generating, with the manufacturing device by an additive manufacturing process, the orthodontic article based on the digital object. A system is also provided, including a display that displays a 3D model of an orthodontic article; and one or more processors that, in response to the 3D model selected by a user, cause a 3D printer to create a physical object of an orthodontic article.
    Type: Application
    Filed: June 27, 2019
    Publication date: June 10, 2021
    Inventors: Thomas P. Klun, Zeba Parkar, John M. Riedesel, Richard J. Pokorny, Chad M. Amb, Benjamin R. Coonce, Robert S. Clough, Tianyu Wu, Saswata Chakraborty, Yongshang Lu, Benjamin C. Mac Murray, Ahmed S. Abuelyaman, Karl J.L. Geisler, Jodi L. Connell, Ta-Hua Yu
  • Publication number: 20210163664
    Abstract: The present disclosure provides an orthodontic article including the reaction product of the photopolymerizable composition. The photopolymerizable composition includes i) a monofunctional (meth)acrylate monomer whose cured homopolymer has a glass transition temperature of 90 degrees Celsius or greater; ii) a photoinitiator; and iii) a polymerization reaction product of components. The components include 1) an isocyanate; 2) a (meth)acrylate mono-ol; 3) a polycarbonate diol; and 4) a catalyst. Further, the present disclosure provides a method of making an orthodontic article. The method includes obtaining a photopolymerizable composition and selectively curing the photopolymerizable composition to form an orthodontic article.
    Type: Application
    Filed: May 21, 2019
    Publication date: June 3, 2021
    Inventors: Thomas P. Klun, Zeba Parkar, John M. Riedesel, Richard J. Pokorny, Chad M. Amb, Benjamin R. Coonce, Robert S. Clough, Tianyu Wu, Saswata Chakraborty, Yongshang Lu, Benjamin C. Mac Murray, Ian Dailey, David B. Olson
  • Publication number: 20210095056
    Abstract: The present disclosure provides a photopolymerizable composition. The photopolymerizable composition includes a) 40-60 parts by weight of a monofunctional (meth)acrylate monomer, per 100 parts of the total photopolymerizable composition; b) a photoinitiator; and c) a polymerization reaction product of components. A cured homopolymer of the monofunctional (meth)acrylate monomer has a glass transition temperature of 125 degrees Celsius or greater. The polymerization reaction product of components includes i) a diisocyanate; ii) a hydroxy functional methacrylate; iii) a polycarbonate diol; and iv) a catalyst. The polymerization reaction product includes a polyurethane methacrylate polymer.
    Type: Application
    Filed: May 21, 2019
    Publication date: April 1, 2021
    Inventors: Thomas P. Klun, Zeba Parkar, John M. Riedesel, Richard J. Pokorny, Chad M. Amb, Benjamin R. Coonce, Robert S. Clough, Tianyu Wu, Saswata Chakraborty, Yongshang Lu, Benjamin C. Mac Murray, Ian Dailey, David B. Olson
  • Publication number: 20210061935
    Abstract: Curable compositions include an acrylate of Formula I: Formula I at least one multifunctional (meth)acrylate with fused aromatic groups, heteroarylene groups, heteroalkylene groups, alkylene groups, or aralkylene groups, and a photoinitiator. The compositions, when cured, have a refractive index of 1.63 or greater at 532 nanometers, are optically transparent, and have a thermal stability such that upon heating for 1 hour at 250° C. they have a weight loss of 3.5% or less.
    Type: Application
    Filed: May 10, 2019
    Publication date: March 4, 2021
    Inventors: Wayne S. Mahoney, Saswata Chakraborty, Evan L. Schwartz, Claire Hartmann-Thompson, Tabitha A. Silliman
  • Patent number: 10899961
    Abstract: Disclosed are quantum dots and quantum dot articles stabilized by a fluorochemical copolymer having pendent arsine, stibine or phosphine stabilizing groups; and pendent fluorochemical groups.
    Type: Grant
    Filed: February 9, 2017
    Date of Patent: January 26, 2021
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Paul B. Armstrong, Saswata Chakraborty, Michael C. Palazzotto
  • Patent number: 10836960
    Abstract: A composite particle that includes: a fluorescent semiconductor core/shell nanoparticle (preferably, nanocrystal); and a stabilizing additive of the formula (I), wherein R1 is a hydrocarbyl group, including aryl, alkaryl, alkyl or aralkyl, preferably at least one of R1 is aryl or alkaryl, more preferably at least two are aryl or alkaryl; R2 is R1 when a is one and a C1-C10 divalent alkylene when a is 2; Z is P, As or Sb.
    Type: Grant
    Filed: September 12, 2016
    Date of Patent: November 17, 2020
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Michael C. Palazzotto, Saswata Chakraborty, Wayne S. Mahoney, Guy D. Joly, Karissa L. Eckert
  • Patent number: 10829687
    Abstract: A composite particle that includes: a fluorescent semiconductor core/shell nanoparticle (preferably, nanocrystal); and a stabilizing additive of the formula (I), wherein R1 is a hydrocarbyl group, including aryl, alkaryl, alkyl or aralkyl, preferably at least one of R1 is aryl or alkaryl, more preferably at least two are aryl or alkaryl; R2 is R1 when a is one and a C1-C10 divalent alkylene when a is 2; Z is P, As or Sb.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: November 10, 2020
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Michael C. Palazzotto, Saswata Chakraborty, Wayne S. Mahoney, Guy D. Joly, Karissa L. Eckert
  • Patent number: 10829686
    Abstract: Disclosed are quantum dots and quantum dot articles stabilized by a stabilizing agent of the formula: wherein each R1 is a hydrocarbyl group including alkyl, aryl, alkaryl and aralkyl; R2 is a divalent hydrocarbyl group selected from alkylene, arylene, alkarylene and aralkylene; Z is P, As or Sb; Q is —CH2—S—, —CH2—O—, —CO2—, —CH2—O—CO—, —CONR3—, —NH—CO—NR3—, and —NR3, where R3 is H or C1-C4 alkyl, subscript x is 1, R6 is a divalent hydrocarbyl group selected from alkylene, arylene, alkarylene and aralkylene, subscript y is 0 or 1, Rf is a perfluoroether group.
    Type: Grant
    Filed: March 23, 2017
    Date of Patent: November 10, 2020
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Paul B. Armstrong, Saswata Chakraborty, Michael C. Palazzotto, Guy D. Joly