Patents by Inventor Dave Narasimhan

Dave Narasimhan 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: 11718064
    Abstract: A light weight flexible flame, arc flash and flash fire resistant fabric for protective garments is made from a flexible polyvinylchloride sheet having phthalate or phthalate free plasticizers coated with well defined parallel lines or grids of adhesive layer. The adhesive coated polyvinylchloride sheet contacts a non-woven meta-aramid fiber liner and is heated to produce a bond between the polyvinylchloride sheet and the liner. Both polyvinylchloride sheet and meta-aramid non-woven liner resist heat. When heat from arc flash or flash fire is applied, the heat is conducted away at local contacting regions of the adhesive with the polyvinylchloride sheet to the liner whereby the temperature of the polyvinylchloride is locally reduced preventing sagging, charring or burning of the space between adhesive contacting regions. This structure produces mechanically strong lightweight arc flash and flash fire resistant fabric suited for producing garments that meet all ASTM specifications for fireproof garments.
    Type: Grant
    Filed: October 5, 2018
    Date of Patent: August 8, 2023
    Assignee: Tingley Rubber Corporation
    Inventors: Brian C. Nutt, James P. Towey, Dave Narasimhan, Michael S. Zedalis
  • Publication number: 20220125999
    Abstract: A synthetic polyisoprene latex emulsion has pre-vulcanization composition and post vulcanization composition. The pre-vulcanization composition comprises insoluble amorphous sulfur extracted with zinc dithiocarbamate catalyst at 20° C. to form sulfur chain and transported to interior of synthetic polyisoprene particle forming physical attachment of sulfur to active sites. The degree of pre-vulcanization is verified by expansion of cast and dried film of latex in toluene in 20 minutes by means of a swelling index test. The latex emulsion is vulcanized at 90° C. to 120° C. for 3 to 5 minutes. Post-vulcanization composition with accelerators crosslink between synthetic polyisoprene particles, uniformly curing both in the inter-particle and intra-particle regions to produce high cross link density, uniform distribution of double bonds with zinc segregation at the boundaries of original particles.
    Type: Application
    Filed: October 22, 2020
    Publication date: April 28, 2022
    Applicant: Thai Nippon Rubber Industry Public Company Limited
    Inventors: Pathompong Chupayak, Theeraphol Piachan, Supparat Piachan, Brian Youichi Kempimook, Punyawat Chupayak, Waranyu Dararattanaroj, Dave Narasimhan, Sudarshan Narasimhan
  • Publication number: 20210337930
    Abstract: A shoe cover is a natural latex article with reduced amount of sulfur cross linking agent and accelerators including zinc dithiocarbamate that break catalytically soluble sulfur S8 sulfur rings forming sulfur linear chains. Surfactants present in the pre-vulcanization composition wets natural polyisoprene particles and permeates small sized sulfur into the interior of these particles thereby pre-vulcanizing the particles. The latex emulsion also has post-vulcanization composition with accelerators that crosslink between particles during the post vulcanization cure cycle. The dipped natural polyisoprene article is substantially uniformly cured both in the inter-particle and intra-particle regions and reliably exhibits high cross link density, uniform distribution of double bonds and zinc segregation at the boundaries or original particles. The natural rubber films exhibit high tensile strength, tensile modulus, tear strength, elongation with low modulus of the shoe cover.
    Type: Application
    Filed: April 29, 2020
    Publication date: November 4, 2021
    Applicant: UA Thomas Co. Ltd.
    Inventors: Thomas M. McKnatt, Buncha Tomogol, Noppadol Polbundit, Dave Narasimhan, Sudarshan Narasimhan
  • Patent number: 10538609
    Abstract: A synthetic polyisoprene latex emulsion has pre-vulcanization composition and post vulcanization composition. The pre-vulcanization composition comprises soluble sulfur with high S8 ring structure that is catalytically broken by a zinc dithiocarbamate. Surfactants present in the pre-vulcanization composition wets synthetic polyisoprene particles and permeates small sized sulfur and accelerator molecules into the interior of these particles thereby pre-vulcanizing the particles. The degree of pre-vulcanization is verified by isopropanol index test. The latex emulsion has post-vulcanization composition with accelerators that crosslink inter-particle region during post vulcanization cure cycle. The dipped synthetic polyisoprene article is substantially uniformly cured both in the inter-particle and intra-particle regions and reliably exhibits high cross link density, uniform distribution of double bonds in TEM and zinc segregation at the boundaries or original particles by electron microprobe analysis.
    Type: Grant
    Filed: June 28, 2017
    Date of Patent: January 21, 2020
    Assignee: Lifestyles Healthcare Pte. Ltd.
    Inventors: David M. Lucas, Sugath Amarasekera, Dave Narasimhan, Adeline Ai Lin Kung
  • Publication number: 20190105867
    Abstract: A light weight flexible flame, arc flash and flash fire resistant fabric for protective garments is made from a flexible polyvinylchloride sheet having phthalate or phthalate free plasticizers coated with well defined parallel lines or grids of adhesive layer. The adhesive coated polyvinylchloride sheet contacts a non-woven meta-aramid fiber liner and is heated to produce a bond between the polyvinylchloride sheet and the liner. Both polyvinylchloride sheet and meta-aramid non-woven liner resist heat. When heat from arc flash or flash fire is applied, the heat is conducted away at local contacting regions of the adhesive with the polyvinylchloride sheet to the liner whereby the temperature of the polyvinylchloride is locally reduced preventing sagging, charring or burning of the space between adhesive contacting regions. This structure produces mechanically strong lightweight arc flash and flash fire resistant fabric suited for producing garments that meet all ASTM specifications for fireproof garments.
    Type: Application
    Filed: October 5, 2018
    Publication date: April 11, 2019
    Inventors: Brian C. Nutt, James P. Towey, Dave Narasimhan, Michael S. Zedalis
  • Patent number: 10165792
    Abstract: The hunger minimized fasting system relies on providing a blood glucose level at all times in the range of 5 to 10 mM, satisfying glucose needs of the brain and metabolizing blood glucose through anaerobic glycolysis to release ATP at the extramitocontrial portion of the cell. Consuming only solid free nutrient liquids eliminates brain hunger response. Liquids consumed during fasting include solid filtered vegetable soup and clear fruit juices of 8 to 12 ounces taken every 2 to 4 hours having calorie deficiency of 600 to 1400 as compared to minimal daily calorie requirements for an adult. Fat released from storage is metabolized by ATP produced by glycolysis at the extramitocontrial location and enters the interior of the mitochondria, enabling the TCA cycle. Weight loss observed during fasting is about one half to one pound per day.
    Type: Grant
    Filed: July 27, 2016
    Date of Patent: January 1, 2019
    Inventors: Sudarshan Narasimhan, Dave Narasimhan
  • Patent number: 10137662
    Abstract: A light weight flexible flame, arc flash and flash fire resistant fabric for protective garments is made from a flexible polyvinylchloride sheet having phthalate or phthalate free plasticizers coated with well defined parallel lines or grids of adhesive layer. The adhesive coated polyvinylchloride sheet contacts a non-woven meta-aramid fiber liner and is heated to produce a bond between the polyvinylchloride sheet and the liner. Both polyvinylchloride sheet and meta-aramid non-woven liner resist heat. When heat from arc flash or flash fire is applied, the heat is conducted away at local contacting regions of the adhesive with the polyvinylchloride sheet to the liner whereby the temperature of the polyvinylchloride is locally reduced preventing sagging, charring or burning of the space between adhesive contacting regions. This structure produces mechanically strong lightweight arc flash and flash fire resistant fabric suited for producing garments that meet all ASTM specifications for fireproof garments.
    Type: Grant
    Filed: August 5, 2014
    Date of Patent: November 27, 2018
    Assignee: Tingley Rubber Corporation
    Inventors: Brian C. Nutt, James P. Towey, Dave Narasimhan, Michael S. Zedalis
  • Patent number: 10119209
    Abstract: Lightweight robust flexible gloves having an 18 gauge knitted liner and a polymeric coating disposed thereon and optionally including knitted reinforcement sections at areas of high stretch and/or movement are provided. Reinforcement sections can be formed by plaiting, using yarns of the same or lighter denier, and/or forming Jacquard or transfer stitches.
    Type: Grant
    Filed: January 10, 2014
    Date of Patent: November 6, 2018
    Assignee: Ansell Healthcare Products LLC
    Inventors: Eric Thompson, Dave Narasimhan, Jeffrey C. Moreland, Hafsah binti Mohd. Ghazaly
  • Publication number: 20170298159
    Abstract: A synthetic polyisoprene latex emulsion has pre-vulcanization composition and post vulcanization composition. The pre-vulcanization composition comprises soluble sulfur with high S8 ring structure that is catalytically broken by a zinc dithiocarbamate. Surfactants present in the pre-vulcanization composition wets synthetic polyisoprene particles and permeates small sized sulfur and accelerator molecules into the interior of these particles thereby pre-vulcanizing the particles. The degree of pre-vulcanization is verified by isopropanol index test. The latex emulsion has post-vulcanization composition with accelerators that crosslink inter-particle region during post vulcanization cure cycle. The dipped synthetic polyisoprene article is substantially uniformly cured both in the inter-particle and intra-particle regions and reliably exhibits high cross link density, uniform distribution of double bonds in TEM and zinc segregation at the boundaries or original particles by electron microprobe analysis.
    Type: Application
    Filed: June 28, 2017
    Publication date: October 19, 2017
    Inventors: David M. Lucas, Sugath Amarasekera, Dave Narasimhan, Adeline Ai Lin Kung
  • Patent number: 9725539
    Abstract: A synthetic polyisoprene latex emulsion has pre-vulcanization composition and post vulcanization composition. The pre-vulcanization composition comprises soluble sulfur with high S8 ring structure that is catalytically broken by a zinc dithiocarbamate. Surfactants present in the pre-vulcanization composition wets synthetic polyisoprene particles and permeates small sized sulfur and accelerator molecules into the interior of these particles thereby pre-vulcanizing the particles. The degree of pre-vulcanization is verified by isopropanol index test. The latex emulsion has post-vulcanization composition with accelerators that crosslink inter-particle region during post vulcanization cure cycle. The dipped synthetic polyisoprene article is substantially uniformly cured both in the inter-particle and intra-particle regions and reliably exhibits high cross link density, uniform distribution of double bonds in TEM and zinc segregation at the boundaries or original particles by electron microprobe analysis.
    Type: Grant
    Filed: May 29, 2015
    Date of Patent: August 8, 2017
    Assignee: Ansell Healthcare Products LLC
    Inventors: David M. Lucas, Sugarth Amarasekera, Dave Narasimhan, Adeline Ai Lin Kung
  • Patent number: 9579532
    Abstract: Provided among other things is a breach or contamination indicating elastomeric article for indicating a breach or contamination by a selected chemical or group of chemicals, the article having an exterior and interior and comprising: (a) an interior elastomeric layer selected to resist permeation by the selected chemical(s), which interior layer is colored; and (b) a contiguous or dis-contiguous indicating layer comprising solid particles of hydrophobic dye effective to provide enhanced color on contacting hexane, cyclohexane, xylene, ethyl ether, butyl acetate, MIBK, methanol, acetonitrile and acetic acid; wherein the distribution of the indicating layer provides for a visually noticeable color change against the background of the colored interior elastomeric layer upon a breach or contamination event by a selected chemical.
    Type: Grant
    Filed: March 11, 2014
    Date of Patent: February 28, 2017
    Assignee: Ansell Limited
    Inventors: Noorman Bin Abu Hassan, Michael S. Zedalis, Dave Narasimhan
  • Publication number: 20160366925
    Abstract: The hunger minimized fasting system relies on providing a blood glucose level at all times in the range of 5 to 10 mM, satisfying glucose needs of the brain and metabolizing blood glucose through anaerobic glycolysis to release ATP at the extramitocontrial portion of the cell. Consuming only solid free nutrient liquids eliminates brain hunger response. Liquids consumed during fasting include solid filtered vegetable soup and clear fruit juices of 8 to 12 ounces taken every 2 to four hours having calorie deficiency of 600 to 1400 as compared to minimal daily calorie requirements for an adult. Fat released from storage is metabolized by ATP produced by glycolysis at the extramitocontrial location and enters the interior of the mitochondria, enabling the TCA cycle. Weight loss observed during fasting is about one half to one pound per day.
    Type: Application
    Filed: July 27, 2016
    Publication date: December 22, 2016
    Inventors: Sudarshan Narasimhan, Dave Narasimhan
  • Publication number: 20160281039
    Abstract: An insulated beer fridge stores and ages corked craft beer in a vertical orientation for a period of several months to years without degrading the cork stopper used to seal the bottle. Cork shrinkage is prevented by controlling the humidity within the beer fridge container within a range of 50% to 70% relative humidity. An optimal beer aging temperature in the range of 10° C. (50° F.) to 15.6° C. (60° F.) is maintained by a refrigeration system. Relative humidity within the beer fridge containment is actively maintained by a humidity replenishment mechanism. A controller calculates the amount of water needed to bring the relative humidity to 50% to 70% at the beer fridge temperature. Beers are stored in the beer fridge on trays, which can be pulled for removal of aged beer and addition of new corked craft beer.
    Type: Application
    Filed: March 26, 2015
    Publication date: September 29, 2016
    Inventors: Sandya Lakshmi Narasimhan, Dave Narasimhan, Joseph Francis Leibrandt
  • Patent number: 9434918
    Abstract: An insulated beer fridge stores and ages corked craft beer in a vertical orientation for a period of several months to years without degrading the cork stopper used to seal the bottle. Cork shrinkage is prevented by controlling the humidity within the beer fridge container within a range of 50% to 70% relative humidity. An optimal beer aging temperature in the range of 10° C. (50° F.) to 15.6° C. (60° F.) is maintained by a refrigeration system. Relative humidity within the beer fridge containment is actively maintained by a humidity replenishment mechanism. A controller calculates the amount of water needed to bring the relative humidity to 50% to 70% at the beer fridge temperature. Beers are stored in the beer fridge on trays, which can be pulled for removal of aged beer and addition of new corked craft beer.
    Type: Grant
    Filed: March 26, 2015
    Date of Patent: September 6, 2016
    Inventors: Sandya Lakshmi Narasimhan, Dave Narasimhan, Joseph Francis Leibrandt
  • Publication number: 20160100615
    Abstract: The hunger minimized fasting system relies on providing a blood glucose level at all times in the range of 5 to 10 mM, satisfying glucose needs of the brain and metabolizing blood glucose through anaerobic glycolysis to release ATP at the extramitocontrial portion of the cell. Consuming only solid free nutrient liquids eliminates brain hunger response. Liquids consumed during fasting include solid filtered vegetable soup and clear fruit juices of 8 to 12 ounces taken every 2 to 4 hours having calorie deficiency of 600 to 1400 as compared to minimal daily calorie requirements for an adult. Fat released from storage is metabolized by ATP produced by glycolysis at the extramitocontrial location and enters the interior of the mitochondria, enabling the TCA cycle. Weight loss observed during fasting is about one half to one pound per day.
    Type: Application
    Filed: October 10, 2014
    Publication date: April 14, 2016
    Inventors: Sudarshan Narasimhan, Dave Narasimhan
  • Publication number: 20160039170
    Abstract: A light weight flexible flame, arc flash and flash fire resistant fabric for protective garments is made from a flexible polyvinylchloride sheet having phthalate or phthalate free plasticizers coated with well defined parallel lines or grids of adhesive layer. The adhesive coated polyvinylchloride sheet contacts a non-woven meta-aramid fiber liner and is heated to produce a bond between the polyvinylchloride sheet and the liner. Both polyvinylchloride sheet and meta-aramid non-woven liner resist heat. When heat from arc flash or flash fire is applied, the heat is conducted away at local contacting regions of the adhesive with the polyvinylchloride sheet to the liner whereby the temperature of the polyvinylchloride is locally reduced preventing sagging, charring or burning of the space between adhesive contacting regions. This structure produces mechanically strong lightweight arc flash and flash fire resistant fabric suited for producing garments that meet all ASTM specifications for fireproof garments.
    Type: Application
    Filed: August 5, 2014
    Publication date: February 11, 2016
    Inventors: Brian C. Nutt, James P. Towey, Dave Narasimhan, Michael S. Zedalis
  • Publication number: 20150259451
    Abstract: A synthetic polyisoprene latex emulsion has pre-vulcanization composition and post vulcanization composition. The pre-vulcanization composition comprises soluble sulfur with high S8 ring structure that is catalytically broken by a zinc dithiocarbamate. Surfactants present in the pre-vulcanization composition wets synthetic polyisoprene particles and permeates small sized sulfur and accelerator molecules into the interior of these particles thereby pre-vulcanizing the particles. The degree of pre-vulcanization is verified by isopropanol index test. The latex emulsion has post-vulcanization composition with accelerators that crosslink inter-particle region during post vulcanization cure cycle. The dipped synthetic polyisoprene article is substantially uniformly cured both in the inter-particle and intra-particle regions and reliably exhibits high cross link density, uniform distribution of double bonds in TEM and zinc segregation at the boundaries or original particles by electron microprobe analysis.
    Type: Application
    Filed: May 29, 2015
    Publication date: September 17, 2015
    Inventors: David M. Lucas, Sugarth Amarasekera, Dave Narasimhan, Adeline Ai Lin Kung
  • Patent number: 9074027
    Abstract: A synthetic polyisoprene latex emulsion has pre-vulcanization composition and post vulcanization composition. The pre-vulcanization composition comprises soluble sulfur with high S8 ring structure that is catalytically broken by a zinc dithiocarbamate. Surfactants present in the pre-vulcanization composition wets synthetic polyisoprene particles and permeates small sized sulfur and accelerator molecules into the interior of these particles thereby pre-vulcanizing the particles. The degree of pre-vulcanization is verified by isopropanol index test. The latex emulsion has post-vulcanization composition with accelerators that crosslink inter-particle region during post vulcanization cure cycle. The dipped synthetic polyisoprene article is substantially uniformly cured both in the inter-particle and intra-particle regions and reliably exhibits high cross link density, uniform distribution of double bonds in TEM and zinc segregation at the boundaries or original particles by electron microprobe analysis.
    Type: Grant
    Filed: June 5, 2013
    Date of Patent: July 7, 2015
    Assignee: Ansell Healthcare Products LLC
    Inventors: David M. Lucas, Sugarth Amarasekera, Dave Narasimhan, Adeline Ai Lin Kung
  • Patent number: 9074029
    Abstract: A synthetic polyisoprene latex emulsion has pre-vulcanization composition and post vulcanization composition. The pre-vulcanization composition comprises soluble sulfur with high S8 ring structure that is catalytically broken by a zinc dithiocarbamate. Surfactants present in the pre-vulcanization composition wets synthetic polyisoprene particles and permeates small sized sulfur and accelerator molecules into the interior of these particles thereby pre-vulcanizing the particles. The degree of pre-vulcanization is verified by isopropanol index test. The latex emulsion has post-vulcanization composition with accelerators that crosslink inter-particle region during post vulcanization cure cycle. The dipped synthetic polyisoprene article is substantially uniformly cured both in the inter-particle and intra-particle regions and reliably exhibits high cross link density, uniform distribution of double bonds in TEM and zinc segregation at the boundaries or original particles by electron microprobe analysis.
    Type: Grant
    Filed: February 10, 2014
    Date of Patent: July 7, 2015
    Assignee: Ansell Healthcare Products LLC
    Inventors: David M. Lucas, Sugarth Amarasekera, Dave Narasimhan, Adeline Ai Lin Kung
  • Publication number: 20140259332
    Abstract: Provided among other things is a breach or contamination indicating elastomeric article for indicating a breach or contamination by a selected chemical or group of chemicals, the article having an exterior and interior and comprising: (a) an interior elastomeric layer selected to resist permeation by the selected chemical(s), which interior layer is colored; and (b) a contiguous or dis-contiguous indicating layer comprising solid particles of hydrophobic dye effective to provide enhanced color on contacting hexane, cyclohexane, xylene, ethyl ether, butyl acetate, MIBK, methanol, acetonitrile and acetic acid; wherein the distribution of the indicating layer provides for a visually noticeable color change against the background of the colored interior elastomeric layer upon a breach or contamination event by a selected chemical.
    Type: Application
    Filed: March 11, 2014
    Publication date: September 18, 2014
    Applicant: Ansell Limited
    Inventors: Noorman Bin Abu Hassan, Michael S. Zedalis, Dave Narasimhan