Patents by Inventor Wei Cheong Wong

Wei Cheong Wong 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: 20230416471
    Abstract: An elastomeric article having a rubber component comprising polyisoprene and an aldehyde aniline condensate, the elastomeric article having less than 1 ppm diisopropyl xanthogen polysulfide residue.
    Type: Application
    Filed: September 5, 2023
    Publication date: December 28, 2023
    Inventors: Seong Fong Chen, Wei Cheong Wong
  • Patent number: 11780972
    Abstract: An elastomeric article having a rubber component comprising polyisoprene and an aldehyde aniline condensate, the elastomeric article having less than 1 ppm diisopropyl xanthogen polysulfide residue.
    Type: Grant
    Filed: February 1, 2022
    Date of Patent: October 10, 2023
    Assignee: ALLEGIANCE CORPORATION
    Inventors: Seong Fong Chen, Wei Cheong Wong
  • Publication number: 20220251311
    Abstract: An elastomeric article having a rubber component comprising polyisoprene and an aldehyde aniline condensate, the elastomeric article having less than 1 ppm diisopropyl xanthogen polysulfide residue.
    Type: Application
    Filed: February 1, 2022
    Publication date: August 11, 2022
    Inventors: Seong Fong CHEN, Wei Cheong WONG
  • Patent number: 11242435
    Abstract: An elastomeric article having a rubber component comprising polyisoprene and an aldehyde aniline condensate, the elastomeric article having less than 1 ppm diisopropyl xanthogen polysulfide residue.
    Type: Grant
    Filed: July 9, 2020
    Date of Patent: February 8, 2022
    Assignee: ALLEGIANCE CORPORATION
    Inventors: Seong Fong Chen, Wei Cheong Wong
  • Publication number: 20200339767
    Abstract: An elastomeric article having a rubber component comprising polyisoprene and an aldehyde aniline condensate, the elastomeric article having less than 1 ppm diisopropyl xanthogen polysulfide residue.
    Type: Application
    Filed: July 9, 2020
    Publication date: October 29, 2020
    Inventors: Seong Fong CHEN, Wei Cheong WONG
  • Publication number: 20200299532
    Abstract: The present invention is directed to antistatic elastomeric articles and methods of making the same. The articles can be single layered or multilayered. The single layered articles possess desirable antistatic properties and desirable properties of comfort and feel. The multilayered articles have an outermost layer/surface that possesses desirable antistatic properties and an innermost layer/surface that exhibits desirable properties of comfort and feel. In preferred embodiments, the elastomeric articles are made form a nitrile/natural rubber blend. Articles of the present invention have antistatic properties measured as having a surface resistivity below about 1014 ?/sq and a static decay time of less than about 60 seconds.
    Type: Application
    Filed: June 5, 2020
    Publication date: September 24, 2020
    Inventors: Seong Fong CHEN, Wei Cheong WONG, Chii Yih LOW
  • Patent number: 10759913
    Abstract: This invention relates generally to vulcanization compounds and relates more specifically to vulcanization compositions with reduced allergenic potential that include accelerator compositions for vulcanizing elastomeric articles. Vulcanization compositions are disclosed that include a single fugitive dihydrocarbyl xanthogen polysulfide accelerator and a single aldehyde-aniline condensate accelerator.
    Type: Grant
    Filed: December 11, 2018
    Date of Patent: September 1, 2020
    Assignee: Allegiance Corporation
    Inventors: Seong Fong Chen, Wei Cheong Wong
  • Patent number: 10752738
    Abstract: An aqueous elastomer dispersion includes a dispersed phase and an aqueous phase. The dispersed phase includes an elastomer including curable aliphatic conjugated-diene elastomers, such as polyisoprene, and a minor amount of at least one additive. The aqueous phase includes water and other optional components in either a soluble state or a dispersion state. The aqueous elastomer dispersion may be prepared by dissolving an elastomer, such as rubber, and additives in a solvent mixture and then converting the resulting solution into an aqueous emulsion. The aqueous emulsion is concentrated and the solvent is stripped from it to yield a dilute latex. The dilute latex that is obtained is concentrated again. Articles made from the aqueous elastomer dispersion include medical gloves, condoms, probe covers, dental dams, finger cots, catheters and the like.
    Type: Grant
    Filed: December 20, 2018
    Date of Patent: August 25, 2020
    Assignee: ALLEGIANCE CORPORATION
    Inventors: Shiping Wang, Seong Fong Chen, Ida Berger, Yun-Siung Tony Yeh, Wei Cheong Wong
  • Patent number: 10752798
    Abstract: The present invention is directed to antistatic elastomeric articles and methods of making the same. The articles can be single layered or multilayered. The single layered articles possess desirable antistatic properties and desirable properties of comfort and feel. The multilayered articles have an outermost layer/surface that possesses desirable antistatic properties and an innermost layer/surface that exhibits desirable properties of comfort and feel. In preferred embodiments, the elastomeric articles are made form a nitrile/natural rubber blend. Articles of the present invention have antistatic properties measured as having a surface resistivity below about 1014 ?/sq and a static decay time of less than about 60 seconds.
    Type: Grant
    Filed: December 9, 2015
    Date of Patent: August 25, 2020
    Assignee: Allegiance Corporation
    Inventors: Seong Fong Chen, Wei Cheong Wong, Chii Yih Low
  • Publication number: 20200206392
    Abstract: The invention described herein relates to a therapeutic, moisturizing coating composition for elastomeric articles which is applied directly onto the skin-contacting surface of the article as part of the manufacturing process. The coating composition is thermally stable and subsequently hydrates when contacted with a moisturized skin surface to convert into a liquid “lotion” form during wearing of the article. The coating composition provides therapeutic benefits to the wearer's skin as a result of wearing the article, such as improved skin moisturization, softness of feel, improved skin elasticity and firmness, and reduced redness and irritation. The invention is particularly useful in medical gloves, including examination and surgical gloves.
    Type: Application
    Filed: January 24, 2020
    Publication date: July 2, 2020
    Inventors: Shiping WANG, Yun-Siung Tony YEH, James OWENS, Wei Cheong WONG
  • Patent number: 10662347
    Abstract: Methods for preparing copolymeric emulsions from at least one water soluble monomer and at least one water insoluble monomer are disclosed herein. In some embodiments, one or more surfactants and stabilizers may be used. In some embodiments, the monomers used in the process include, by total monomer weight, at least 50% water soluble monomers and at least 10% water insoluble monomers. Copolymer emulsions formed from the reaction product of at least one water soluble monomer and at least one water insoluble monomer are also disclosed along with articles coated with such emulsions and coating formulations made from such emulsions as well as methods for the manufacture and coating of such articles.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: May 26, 2020
    Assignee: ALLEGIANCE CORPORTATION
    Inventors: Daniel L. Holguin, Andre Mayer, Suo Phong Lee, Michael Meyers, Dennis Kopp, Wei Cheong Wong, Chii Yih Low, Shiping Wang, Xiaochuan Hu, Chuang Sim Chong
  • Patent number: 10517338
    Abstract: This invention relates to an elastomeric article with improved lubricity and donnablity and reduced stickiness/tackiness. According to the methods of the invention, the internal surface of the elastomeric article is coated with a polyisoprene coating. The coating of the invention is formed from synthetic polyisoprene rubber that may or may not contain minor amounts of other components. The coating is preferably directly bonded to the underlying elastomeric article.
    Type: Grant
    Filed: January 19, 2017
    Date of Patent: December 31, 2019
    Assignee: ALLEGIANCE CORPORATION
    Inventors: Seong Fong Chen, Shiping Wang, Wei Cheong Wong, Chuang Sim Chong
  • Patent number: 10472110
    Abstract: The present invention relates generally to methods of sterilizing elastomeric articles in a manner that prevents and/or reduces degradation to the articles, particularly degradation that may be caused and/or accelerated by sterilization techniques such as gamma irradiation, x-ray irradiation, and electron-beam processing. The methods include packaging the elastomeric articles in order to improve their resistance to degradation. In certain aspects of the invention, packaged elastomeric articles, optionally containing one or more antidegradants, such as antioxidant and/or antiozonant compounds, are also provided. The methods of providing degradation-resistant elastomeric articles in accordance with the present invention may also be used to reduce the occurrence of cracking and discoloration in elastomeric articles, regardless of whether they are subjected to sterilization.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: November 12, 2019
    Assignee: ALLEGIANCE CORPORATION
    Inventors: Seong Fong Chen, Wei Cheong Wong
  • Publication number: 20190292331
    Abstract: An aqueous elastomer dispersion includes a dispersed phase and an aqueous phase. The dispersed phase includes an elastomer including curable aliphatic conjugated-diene elastomers, such as polyisoprene, and a minor amount of at least one additive. The aqueous phase includes water and other optional components in either a soluble state or a dispersion state. The aqueous elastomer dispersion may be prepared by dissolving an elastomer, such as rubber, and additives in a solvent mixture and then converting the resulting solution into an aqueous emulsion. The aqueous emulsion is concentrated and the solvent is stripped from it to yield a dilute latex. The dilute latex that is obtained is concentrated again. Articles made from the aqueous elastomer dispersion include medical gloves, condoms, probe covers, dental dams, finger cots, catheters and the like.
    Type: Application
    Filed: December 20, 2018
    Publication date: September 26, 2019
    Applicant: ALLEGIANCE CORPORATION
    Inventors: SHIPING WANG, SEONG FONG CHEN, IDA BERGER, YUN-SIUNG TONY YEH, WEI CHEONG WONG
  • Patent number: 10421569
    Abstract: The present invention relates generally to methods of sterilizing elastomeric articles in a manner that prevents and/or reduces degradation to the articles, particularly degradation that may be caused and/or accelerated by sterilization techniques such as gamma irradiation, x-ray irradiation, and electron-beam processing. The methods include packaging the elastomeric articles in order to improve their resistance to degradation. In certain aspects of the invention, packaged elastomeric articles, optionally containing one or more antidegradants, such as antioxidant and/or antiozonant compounds, are also provided. The methods of providing degradation-resistant elastomeric articles in accordance with the present invention may also be used to reduce the occurrence of cracking and discoloration in elastomeric articles, regardless of whether they are subjected to sterilization.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: September 24, 2019
    Assignee: Allegiance Corporation
    Inventors: Seong Fong Chen, Wei Cheong Wong
  • Publication number: 20190177496
    Abstract: This invention relates generally to vulcanization compounds and relates more specifically to vulcanization compositions with reduced allergenic potential that include accelerator compositions for vulcanizing elastomeric articles. Vulcanization compositions are disclosed that include a single fugitive dihydrocarbyl xanthogen polysulfide accelerator and a single aldehyde-aniline condensate accelerator.
    Type: Application
    Filed: December 11, 2018
    Publication date: June 13, 2019
    Inventors: Seong Fong Chen, Wei Cheong Wong
  • Publication number: 20190059479
    Abstract: Described are systems, devices, and methods for stripping a formed thin film elastomeric article such as a latex or synthetic polymer medical or surgical glove from a mold, inverting the article, and transferring and securing the inverted article to a mandrel for further on-line processing, integrating dip forming and off-line surface treatment processes into a single, continuous on-line process. The system can include a stripping apparatus including an actuation device for peeling the article from the mold and inverting the article, and a donning device to receive the inverted article. The system may position the article about a mandrel of the donning device. The mandrel may expand or separate to engage the interior of the inverted article to securely hold the article on the mandrel. The donning device may be coupled to a continuous loop conveyor chain to carry the donning device and the mounted article through on-line secondary processing.
    Type: Application
    Filed: August 23, 2018
    Publication date: February 28, 2019
    Inventors: WEI CHEONG WONG, JASON LIM, TSE-LIANG YEOH
  • Patent number: 10125239
    Abstract: The present invention generally relates to vulcanization compositions used to vulcanize elastomeric articles, where the vulcanization compositions have reduced allergenic potential as compared to elastomeric articles formed using vulcanization compositions having non-fugitive accelerators. The present invention also relates to elastomeric articles formed using the vulcanization compositions. The invention further relates to methods for making a reduced-allergenicity vulcanization composition, and to methods for using the vulcanization compositions to vulcanize elastomeric articles.
    Type: Grant
    Filed: December 12, 2016
    Date of Patent: November 13, 2018
    Assignee: ALLEGIANCE CORPORATION
    Inventors: Seong Fong Chen, Wei Cheong Wong, Chii Yih Low
  • Patent number: 10092047
    Abstract: Described are systems, devices, and methods for stripping a formed thin film elastomeric article such as a latex or synthetic polymer medical or surgical glove from a mold, inverting the article, and transferring and securing the inverted article to a mandrel for further on-line processing, integrating dip forming and off-line surface treatment processes into a single, continuous on-line process. The system can include a stripping apparatus including an actuation device for peeling the article from the mold and inverting the article, and a donning device to receive the inverted article. The system may position the article about a mandrel of the donning device. The mandrel may expand or separate to engage the interior of the inverted article to securely hold the article on the mandrel. The donning device may be coupled to a continuous loop conveyor chain to carry the donning device and the mounted article through on-line secondary processing.
    Type: Grant
    Filed: November 14, 2015
    Date of Patent: October 9, 2018
    Assignee: ALLEGIANCE CORPORATION
    Inventors: Wei Cheong Wong, Jason Lim, Tse-Liang Yeoh
  • Publication number: 20180036457
    Abstract: The invention described herein relates to a therapeutic, moisturizing coating composition for elastomeric articles which is applied directly onto the skin-contacting surface of the article as part of the manufacturing process. The coating composition is thermally stable and subsequently hydrates when contacted with a moisturized skin surface to convert into a liquid “lotion” form during wearing of the article. The coating composition provides therapeutic benefits to the wearer's skin as a result of wearing the article, such as improved skin moisturization, softness of feel, improved skin elasticity and firmness, and reduced redness and irritation. The invention is particularly useful in medical gloves, including examination and surgical gloves.
    Type: Application
    Filed: August 22, 2017
    Publication date: February 8, 2018
    Applicant: ALLEGIANCE CORPORATION
    Inventors: SHIPING WANG, YUN-SIUNG TONY YEH, JAMES OWENS, WEI CHEONG WONG