Patents by Inventor Renhe Lin

Renhe Lin 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).

  • Polyurea compositions and methods of use
    Patent number: 9580635
    Abstract: Disclosed are polyurea compositions comprising the reaction products of a polyformal-isocyanate prepolymer and a curing agent comprising an amine. The compositions are useful as sealants in aerospace applications.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: February 28, 2017
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Nagarajan Srivatsan, Alfredo Reyes, Sean Manion, Juexiao Cai, Marfi Ito, Renhe Lin
  • MOISTURE-CURABLE FUEL-RESISTANT SEALANT SYSTEMS
    Publication number: 20170044399
    Abstract: Sealant systems that are pre-applied to a part to be sealed include a layer of an uncured moisture-curable sealant and a frangible barrier coating applied over the uncured moisture-curable sealant. During assembly, the barrier coating breaks to expose the moisture-curable sealant to moisture to initiate the curing reaction. The moisture-curable sealant systems are suitable for aerospace applications and include sulfur-containing prepolymers. Various curing chemistries can be used.
    Type: Application
    Filed: August 10, 2015
    Publication date: February 16, 2017
    Inventors: BRUCE VIRNELSON, RENHE LIN
  • Sulfone-containing polythioethers, compositions thereof, and methods of synthesis
    Patent number: 9540540
    Abstract: Sulfone-containing polythioethers, compositions containing sulfone-containing polythioethers, methods of synthesizing sulfone-containing polythioethers and the use of sulfone-containing polythioethers in aerospace sealant applications are disclosed. The sulfone-containing polythioethers have sulfone groups incorporated into the backbone of the polythioether. Cured sealant compositions comprising the sulfone-containing polythioethers exhibit enhanced thermal resistance.
    Type: Grant
    Filed: May 11, 2015
    Date of Patent: January 10, 2017
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Chandra Rao, Juexiao Cai, Renhe Lin
  • Uses of UV-curable polythioether sealants for sealing fasteners and for smoothing surfaces
    Patent number: 9533798
    Abstract: UV curable sealants, method s for making the sealants, and method for using the sealants are disclosed. The UV curable sealants may be used in seal caps useful to seal fasteners in aerospace fuel tanks. The UV curable sealants may also be used to smooth defects in surfaces such as aerospace surfaces.
    Type: Grant
    Filed: October 24, 2012
    Date of Patent: January 3, 2017
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Bruce Virnelson, Raquel Keledjian, Renhe Lin, Chandra B. Rao
  • Cure-on-demand moisture-curable urethane-containing fuel resistant prepolymers and compositions thereof
    Patent number: 9518197
    Abstract: Cure-on-demand, moisture-curable, urethane-containing prepolymers having urethanes incorporated into a sulfur-containing prepolymer backbone and compositions thereof for use in sealant applications are disclosed. The cure-on-demand moisture-curable urethane-containing prepolymers are terminated with polyalkoxysilyl groups. The compositions contain a controlled-release moisture cure catalyst. Compositions containing the prepolymers provide cured sealants exhibiting improved tensile strength.
    Type: Grant
    Filed: December 10, 2015
    Date of Patent: December 13, 2016
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Raquel Keledjian, Renhe Lin
  • Controlled release amine-catalyzed, Michael addition-curable sulfur-containing polymer compositions
    Patent number: 9499668
    Abstract: Compositions comprising sulfur-containing polymers such as polythioethers, Michael acceptors, and controlled release amine catalysts employing Michael addition curing chemistries useful in aerospace sealant applications are disclosed. The compositions exhibit extended pot life and the rate of curing can be tailored for specific applications.
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: November 22, 2016
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Juexiao Cai, Lawrence G. Anderson, Renhe Lin
  • METHODS FOR MAKING CURED SEALANTS BY ACTINIC RADIATION AND RELATED COMPOSITIONS
    Publication number: 20160304759
    Abstract: Disclosed are methods for making a cured sealant. The methods include depositing an uncured sealant composition on a substrate and exposing the uncured sealant composition to actinic radiation to provide a cured sealant. The uncured sealant composition includes a thiol-terminated polythioether, a polyene comprising a polyvinyl ether and/or a polyallyl compound, and a hydroxy-functional vinyl ether. Related sealant compositions are also disclosed.
    Type: Application
    Filed: December 4, 2014
    Publication date: October 20, 2016
    Inventors: Raquel Keledjian, Renhe Lin, Chandra Rao, Bruce Virnelson
  • USES OF UV-CURABLE POLYTHIOETHER SEALANTS FOR SEALING FASTENERS AND FOR SMOOTHING SURFACES
    Publication number: 20160304251
    Abstract: UV curable sealants, method s for making the sealants, and method for using the sealants are disclosed. The UV curable sealants may be used in seal caps useful to seal fasteners in aerospace fuel tanks. The UV curable sealants may also be used to smooth defects in surfaces such as aerospace surfaces.
    Type: Application
    Filed: October 24, 2012
    Publication date: October 20, 2016
    Inventors: Bruce Virnelson, Raquel Keledjian, Renhe Lin, Chandra B. Rao
  • Flexible polyamines, flexible amine-terminated adducts, compositions thereof and methods of use
    Patent number: 9422467
    Abstract: Disclosed are flexible polyamines, flexible amine-terminated polyformal adducts, flexible-amine-terminated polythioether adducts, compositions comprising flexible polyamines and isocyanate-terminated prepolymers, and compositions comprising flexible amine-terminated adducts and isocyanate-terminated prepolymers. Uses of the compositions as sealants, and particularly as aerospace sealants, are also disclosed.
    Type: Grant
    Filed: June 18, 2014
    Date of Patent: August 23, 2016
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Stephen J. Hobbs, Marfi Ito, Juexiao Cai, Chandra Rao, Renhe Lin
  • Low density fuel resistant sulfur-containing polymer compositions and uses thereof
    Patent number: 9422451
    Abstract: Low-density compositions and sealants prepared from sulfur-containing prepolymer compositions that exhibit enhanced fuel resistance are disclosed. The low density and enhanced fuel resistance is realized by using polyphenylene sulfide fillers.
    Type: Grant
    Filed: January 9, 2015
    Date of Patent: August 23, 2016
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Chandra Rao, Marfi Ito, Renhe Lin
  • LOW DENSITY FUEL RESISTANT SULFUR-CONTAINING POLYMER COMPOSITIONS AND USES THEREOF
    Publication number: 20160208137
    Abstract: Low-density compositions and sealants prepared from sulfur-containing prepolymer compositions that exhibit enhanced fuel resistance are disclosed. The low density and enhanced fuel resistance is realized by using polyphenylene sulfide fillers.
    Type: Application
    Filed: January 9, 2015
    Publication date: July 21, 2016
    Inventors: Chandra Rao, Marfi Ito, Renhe Lin
  • Michael addition curing chemistries for sulfur-containing polymer compositions employing bis(sulfonyl)alkanols
    Patent number: 9394405
    Abstract: Compositions useful in aerospace sealant applications comprise sulfur-containing polymers such as polythioethers and polysulfides and are cured using Michael addition reactions. Compositions employing Michael addition curing chemistries include sulfur-containing adducts comprising terminal Michael acceptor groups. In particular, the sulfur-containing adducts include terminal 1-(ethylenesulfonyl)-n-(vinylsulfonyl)alkanol groups.
    Type: Grant
    Filed: May 11, 2015
    Date of Patent: July 19, 2016
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Juexiao Cai, Lawrence G. Anderson, Marfi Ito, Renhe Lin
  • Michael addition curing chemistries for sulfur-containing polymer compositions
    Patent number: 9388280
    Abstract: The use of Michael addition curing chemistries in compositions comprising sulfur-containing polymers such as polythioethers and polysulfides useful in aerospace sealant applications are disclosed. Sulfur-containing adducts comprising terminal Michael acceptor groups are also disclosed.
    Type: Grant
    Filed: August 19, 2014
    Date of Patent: July 12, 2016
    Assignee: PRC-Desoto International, Inc.
    Inventors: Lawrence G. Anderson, Juexiao Cai, Marfi Ito, Raquel Keledjian, Renhe Lin
  • Polythioether sealants with enhanced thermal resistance
    Patent number: 9382448
    Abstract: Thiol-terminated polythioether compositions and sealants prepared using the thiol-terminated polythioether compositions that exhibit enhanced retention of elongation following exposure to high temperature are disclosed. The enhanced retention of elongation is realized by incorporating certain phenolic antioxidants into the composition.
    Type: Grant
    Filed: August 29, 2014
    Date of Patent: July 5, 2016
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Juexiao Cai, Emilia Serrano, Bruce Virnelson, Renhe Lin
  • Metal ligand-containing prepolymers, methods of synthesis, and compositions thereof
    Patent number: 9382462
    Abstract: Metal ligand-containing prepolymers, compositions containing metal ligand-containing prepolymers, methods of synthesizing metal ligand-containing prepolymers and the use of metal ligand-containing prepolymers in aerospace sealant applications are disclosed. The metal ligand-containing prepolymers have metal ligands incorporated into the backbone of the prepolymer. Cured sealant compositions comprising the metal ligand-containing prepolymers exhibit enhanced properties suitable for aerospace sealant applications.
    Type: Grant
    Filed: May 12, 2015
    Date of Patent: July 5, 2016
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Chandra Rao, Jun Deng, Renhe Lin
  • Multifunctional sulfur-containing polymers, compositions thereof and methods of use
    Patent number: 9382447
    Abstract: Disclosed are multifunctional sulfur-containing polymers that are the reaction products of a sulfur-containing diol, a polyol containing at least three hydroxyl groups per polyol molecule, and an aldehyde, a ketone, or a combination thereof. Sealant compositions comprising the multifunctional sulfur-containing polymers are also disclosed.
    Type: Grant
    Filed: January 5, 2016
    Date of Patent: July 5, 2016
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Steven J. Hobbs, Gregory J. McCollum, Juexiao Cai, Marfi Ito, Lawrence G. Anderson, Renhe Lin
  • PHOSPHINE-CATALYZED, MICHAEL ADDITION-CURABLE SULFUR-CONTAINING POLYMER COMPOSITIONS
    Publication number: 20160186025
    Abstract: Compositions comprising Michael acceptor-terminated sulfur-containing prepolymers, thiol-terminated sulfur-containing prepolymers, and e phosphine catalysts useful in aerospace sealant applications are disclosed. The compositions exhibit extended pot life, cure rapidly following activation, and provide cured sealants having improved properties useful in aerospace sealant applications.
    Type: Application
    Filed: March 4, 2016
    Publication date: June 30, 2016
    Inventors: LAWRENCE G. ANDERSON, JUEXIAO CAI, MARK P. BOWMAN, RENHE LIN
  • Copolymerizable sulfur-containing adhesion promoters and compositions thereof
    Patent number: 9365677
    Abstract: Disclosed are sulfur-containing polymers containing copolymerizable adhesion promoters and compositions including sealant compositions useful in aerospace applications comprising sulfur-containing polymers containing copolymerizable adhesion promoters. In particular, polythioethers and polysulfides incorporating copolymerizable adhesion promoters are disclosed.
    Type: Grant
    Filed: July 12, 2013
    Date of Patent: June 14, 2016
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Raquel Keledjian, Renhe Lin, Bruce Virnelson
  • Michael addition curing chemistries for sulfur-containing polymer compositions
    Patent number: 9365678
    Abstract: The use of Michael addition curing chemistries in compositions comprising sulfur-containing polymers such as polythioethers and polysulfides useful in aerospace sealant applications are disclosed. Sulfur-containing adducts comprising terminal Michael acceptor groups are also disclosed.
    Type: Grant
    Filed: August 19, 2014
    Date of Patent: June 14, 2016
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Lawrence G. Anderson, Juexiao Cai, Marfi Ito, Raquel Keledjian, Renhe Lin
  • POLYTHIOETHER SEALANTS WITH EXTENDED WORKING TIME
    Publication number: 20160160080
    Abstract: Thiol-terminated polythioether compositions and sealants prepared using the thiol-terminated polythioether compositions that exhibit extended working time and that rapidly cures at room temperature at the end of the working time are disclosed.
    Type: Application
    Filed: December 4, 2014
    Publication date: June 9, 2016
    Inventors: JUEXIAO CAl, RENHE LIN