Patents by Inventor Bimal V. Thakkar

Bimal V. Thakkar 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: 9746592
    Abstract: The relates to multi-layer sealing films for microstructured articles. The multi-layer sealing film may include two or more layers. The multi-layer sealing film has an elastic modulus of at least 3.5×105 kPa and the flexural rigidity of the microstructured article is less than about 4.0×10?8 N·m2.
    Type: Grant
    Filed: June 7, 2016
    Date of Patent: August 29, 2017
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Bimal V. Thakkar, Jeffrey O. Emslander, Bryan C. Feisel
  • Publication number: 20170184763
    Abstract: This disclosure generally relates to retroreflective articles and methods of making such articles.
    Type: Application
    Filed: March 14, 2017
    Publication date: June 29, 2017
    Inventors: Kenneth L. Smith, Michael Benton Free, Bimal V. Thakkar, Raymond C. Chiu
  • Patent number: 9658363
    Abstract: The present application generally relates to EAA films including at least one triazine-based ultraviolet absorber. The present application also generally related to retroreflective sheeting including an EAA film including a triazine-based ultraviolet absorber. One embodiments of the present application relates to a film, comprising poly(ethylene-co-acrylic acid) and a triazine-based UVA. Another embodiment of the present application relates to retroreflective sheeting, comprising: a plurality of cube corner elements; and a body layer adjacent to the cube corner elements, the body layer including poly(ethylene-co-acrylic acid) and a triazine-based UVA.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: May 23, 2017
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: David W. Meitz, Bimal V. Thakkar, David M. Burns, David B. Olson, Lee A. Pavelka
  • Patent number: 9618663
    Abstract: This disclosure generally relates to retroreflective articles and methods of making such articles.
    Type: Grant
    Filed: April 15, 2010
    Date of Patent: April 11, 2017
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Kenneth L. Smith, Michael Benton Free, Bimal V. Thakkar, Raymond C. Chiu
  • Publication number: 20160291220
    Abstract: The relates to multi-layer sealing films for microstructured articles. The multi-layer sealing film may include two or more layers. The multi-layer sealing film has an elastic modulus of at least 3.5×105 kPa and the flexural rigidity of the microstructured article is less than about 4.0×10?8 N·m2.
    Type: Application
    Filed: June 7, 2016
    Publication date: October 6, 2016
    Inventors: Bimal V. Thakkar, Jeffrey O. Emslander, Bryan C. Feisel
  • Publication number: 20160209558
    Abstract: The present application generally relates to retroreflective articles and methods of making retroreflective articles. The retroreflective articles include a substantially amorphous polymeric layer between the body layer and the discrete truncated cube corner elements. The substantially amorphous polymeric layer absorbs, dissipates, and/or accommodates at least some of the stress forces placed on the retroreflective article during processing. As a result, discrete truncated cube corner elements with increased fidelity can be formed.
    Type: Application
    Filed: August 14, 2014
    Publication date: July 21, 2016
    Inventors: Reema Chatterjee, Stephen A. Johnson, Robert F. Watkins, Bimal V. Thakkar
  • Patent number: 9366789
    Abstract: The present application generally relates to multi-layer sealing films, methods of making such films, materials for inclusion in such films, retroreflective sheeting and articles including such films, and methods of making retroreflective sheeting and articles including such films. The multi-layer sealing film may include two or more layers. One exemplary embodiment of a two-layer film includes a first layer including a thermoplastic polymeric material including reaction products of alkylene and reaction products of at least one non-acidic comonomer and a second layer including one of a polyolefin, a polyester, a polymethyl methacrylate, a polyamide, a polycarbonate, an ethylene-methacrylic acid, and a polyurethane. In some embodiments, at least one of the layers of the multi-layer sealing film has an elastic modulus of at least 3.5×105 kPa and the flexural rigidity of the retroreflective article is less than about 4.0×10?8 N·m2.
    Type: Grant
    Filed: May 12, 2011
    Date of Patent: June 14, 2016
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Bimal V. Thakkar, Jeffrey O. Emslander, Bryan C. Feisel
  • Publication number: 20140009824
    Abstract: The present application generally relates to EAA films including at least one triazine-based ultraviolet absorber. The present application also generally related to retroreflective sheeting including an EAA film including a triazine-based ultraviolet absorber. One embodiments of the present application relates to a film, comprising poly(ethylene-co-acrylic acid) and a triazine-based UVA. Another embodiment of the present application relates to retroreflective sheeting, comprising: a plurality of cube corner elements; and a body layer adjacent to the cube corner elements, the body layer including poly(ethylene-co-acrylic acid) and a triazine-based UVA.
    Type: Application
    Filed: March 30, 2012
    Publication date: January 9, 2014
    Applicant: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: David W. Meitz, Bimal V. Thakkar, David M. Burns, David B. Olson, Lee A. Pavelka
  • Publication number: 20130135731
    Abstract: This disclosure generally relates to retroreflective articles and methods of making such articles.
    Type: Application
    Filed: April 15, 2010
    Publication date: May 30, 2013
    Applicant: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Kenneth L. Smith, Michael Benton Free, Bimal V. Thakkar, Raymond C. Chiu
  • Publication number: 20130114143
    Abstract: The present application generally relates to multi-layer sealing films, methods of making such films, materials for inclusion in such films, retroreflective sheeting and articles including such films, and methods of making retroreflective sheeting and articles including such films. The multi-layer sealing film may include two or more layers. One exemplary embodiment of a two-layer film includes a first layer including a thermoplastic polymeric material including reaction products of alkylene and reaction products of at least one non-acidic comonomer and a second layer including one of a polyolefin, a polyester, a polymethyl methacrylate, a polyamide, a polycarbonate, an ethylene-methacrylic acid, and a polyurethane. In some embodiments, at least one of the layers of the multi-layer sealing film has an elastic modulus of at least 3.5×105 kPa and the flexural rigidity of the retroreflective article is less than about 4.0×10?8 N·m2.
    Type: Application
    Filed: May 12, 2011
    Publication date: May 9, 2013
    Applicant: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Bimal V. Thakkar, Jeffrey O. Emslander, Bryan C. Feisel
  • Publication number: 20130114142
    Abstract: This disclosure generally relates to retroreflective articles and methods of making such articles.
    Type: Application
    Filed: April 15, 2010
    Publication date: May 9, 2013
    Applicant: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Michael Benton Free, Mieczyslaw H. Mazurek, Bimal V. Thakkar, Kenneth L. Smith, Suman K. Patel, William D. Coggio, Mikhail L. Pekurovsky, Raymond C. Chiu
  • Publication number: 20130034682
    Abstract: This disclosure generally relates to retroreflective articles and methods of making such articles.
    Type: Application
    Filed: April 15, 2010
    Publication date: February 7, 2013
    Inventors: Michael Benton Free, Bimal V. Thakkar, Mieczyslaw H. Mazurek, Kenneth L. Smith, Suman K. Patel, William D. Coggio, Mikhail L. Pekurovsky
  • Patent number: 8297761
    Abstract: Microstructured articles, such as a retroreflective articles, having a plurality of (e.g. cube-corner) microstructured elements and a seal film layer adhered to portions of the cube-corner elements and/or portions of a (e.g., flexible) body layer. The seal film is a thermoplastic polymeric material comprising reaction products of alkylene in an amount of at least about 50% and reaction products of at least one non-acidic polar monomer.
    Type: Grant
    Filed: September 18, 2009
    Date of Patent: October 30, 2012
    Assignee: 3M Innovative Properties Company
    Inventors: Bimal V. Thakkar, Jeffrey O. Emslander, Steven M. Nielsen, Douglas J. Hall, David G. Schueler
  • Patent number: 7862187
    Abstract: Microstructured articles, such as a retroreflective articles, having a plurality of (e.g. cube-corner) microstructured elements projecting from a major surface are described. The microstructured (e.g.) cube-corner elements or interface with an adjacent layer comprises certain nitrogen-containing ingredients. The inclusion of such nitrogen-containing ingredients can improve the adhesion of the (e.g. cube-corner) elements to adjacent (e.g. olefinic) layers such as a body layer, seal film layer, or combination thereof. The flexible retroreflective articles have a light transmissive polymeric body layer having an elastic modulus of less than 7×108 pascals.
    Type: Grant
    Filed: April 12, 2007
    Date of Patent: January 4, 2011
    Assignee: 3M Innovative Properties Company
    Inventors: Bimal V. Thakkar, David B. Olson
  • Publication number: 20100007954
    Abstract: Microstructured articles, such as a retroreflective articles, having a plurality of (e.g. cube-corner) microstructured elements and a seal film layer adhered to portions of the cube-corner elements and/or portions of a (e.g., flexible) body layer. The seal film is a thermoplastic polymeric material comprising reaction products of alkylene in an amount of at least about 50% and reaction products of at least one non-acidic polar monomer.
    Type: Application
    Filed: September 18, 2009
    Publication date: January 14, 2010
    Inventors: Bimal V. Thakkar, Jeffrey O. Emslander, Steven M. Nielsen, Douglas J. Hall, David G. Schueler
  • Patent number: 7611251
    Abstract: Microstructured articles, such as a retroreflective articles, having a plurality of (e.g. cube-corner) microstructured elements and a seal film layer adhered to portions of the cube-corner elements and/or portions of a (e.g. flexible) body layer. The seal film is a thermoplastic polymeric material comprising reaction products of alkylene in an amount of at least about 50% and reaction products of at least one non-acidic polar monomer.
    Type: Grant
    Filed: April 18, 2006
    Date of Patent: November 3, 2009
    Assignee: 3M Innovative Properties Company
    Inventors: Bimal V. Thakkar, Jeffrey O. Emslander, Steven M. Nielsen, Douglas J. Hall, David G. Schueler
  • Publication number: 20070242357
    Abstract: Microstructured articles, such as a retroreflective articles, having a plurality of (e.g. cube-corner) microstructured elements projecting from a major surface are described. The microstructured (e.g.) cube-corner elements or interface with an adjacent layer comprises certain nitrogen-containing ingredients. The inclusion of such nitrogen-containing ingredients can improve the adhesion of the (e.g. cube-corner) elements to adjacent (e.g. olefinic) layers such as a body layer, seal film layer, or combination thereof. The flexible retroreflective articles have a light transmissive polymeric body layer having an elastic modulus of less than 7×108 pascals.
    Type: Application
    Filed: April 12, 2007
    Publication date: October 18, 2007
    Inventors: Bimal V. Thakkar, David B. Olson
  • Patent number: 6861141
    Abstract: A pavement marking article that has an adhesive composition for adhering the article to a pavement substrate, where the adhesive composition includes a reaction product of an acrylic acid ester of a monohydric alcohol whose homopolymer has a Tg less than 0° C., a non-polar ethylenically unsaturated monomer, and 0-10 parts by weight of a polar ethylenically unsaturated monomer. Preferably the amount of the acrylic acid ester is about 60-90 parts by weight, and the amount of the non-polar ethylenically unsaturated monomer is about 10-40 parts by weight. Also, a raised pavement marker that comprises: (a) a pavement marker body having upper and lower surfaces and an apparent flexural modulus of at least about 50,000 psi and (b) a pressure sensitive adhesive layer disposed upon the lower surface of the marker, wherein the adhesive has: (i) a transition region that begins at a frequency of about 10,000 radians/s or more and extends to a frequency of about 100 radians/s or less at about 25° C.
    Type: Grant
    Filed: August 22, 2002
    Date of Patent: March 1, 2005
    Inventors: Gina M. Buccellato, Cristina U. Thomas, Bimal V. Thakkar, Greggory S. Bennett, Sithya S. Khieu, Gary R. Miron
  • Publication number: 20040241393
    Abstract: The invention relates to retroreflective articles such as sheeting comprising a microstructured adhesive.
    Type: Application
    Filed: May 29, 2003
    Publication date: December 2, 2004
    Applicant: 3M Innovative Properties Company
    Inventors: Bimal V. Thakkar, Mieczyslaw H. Mazurek
  • Patent number: 6677030
    Abstract: An article comprising (a) a curved substrate having a surface energy below about 38 dynes/cm2; (b) flexible retroreflective sheeting; and (c) a crosslinked pressure-sensitive adhesive adhering the sheeting to the curved substrate. The adhesive contains sufficient polar monomer and tackifier, and is sufficiently crosslinked, to (i) have a glass transition temperature less than −15° C., (ii) permit the sheeting to remain firmly bonded to a low density polyethylene barrel without buckling when cooled from 49° C. to −1° C., and (iii) provide an adhesive bond to the barrel that exhibits increased energy absorption when tested for impact resistance at 0° C. according to ASTM D4272. The adhesive can be manufactured by partially polymerizing some of the ingredients in a pouch using UV radiation, dispersing the pouch and its contents in the other ingredients using an extruder, extrusion coating the adhesive and then UV crosslinking the coating.
    Type: Grant
    Filed: April 5, 2001
    Date of Patent: January 13, 2004
    Assignee: 3M Innovative Properties Company
    Inventors: Bimal V. Thakkar, Albert I. Everaerts