Patents by Inventor Chandra B. Rao

Chandra B. Rao 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).

  • LOW NUCLEATION TEMPERATURE POLYTHIOETHER PREPOLYMERS AND USES THEREOF
    Publication number: 20230105535
    Abstract: Polythioether prepolymers that have a low nucleation temperature are disclosed. The polythioether prepolymers are stable at low temperature storage conditions for an extended period of time. Compositions prepared using the low nucleation temperature polythioether prepolymers are useful as sealants.
    Type: Application
    Filed: December 17, 2020
    Publication date: April 6, 2023
    Applicant: PRC-Desoto International, Inc.
    Inventor: Chandra B. Rao
  • 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
  • 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
  • POLYTHIOETHER POLYMERS, METHODS FOR PREPARATION THEREOF, AND COMPOSITIONS COMPRISING THEM
    Publication number: 20150315416
    Abstract: Disclosed are poilythioethers that are the reaction product of reactants that include: a) an isocyanurate-containing trithiol; b) a polythiol different from (a); and c) a diene. Also disclosed are compositions, such as sealant compositions, that include such polythioethers.
    Type: Application
    Filed: June 1, 2015
    Publication date: November 5, 2015
    Inventors: CHARLES M. KANIA, RENHE LIN, CHANDRA B. RAO
  • Polyfunctional sulfur-containing epoxies and compositions thereof
    Patent number: 8710159
    Abstract: Disclosed are polyfunctional sulfur-containing epoxies and compositions containing polyfunctional sulfur-containing epoxies. The polyfunctional sulfur-containing epoxies may be used as a curing agent and combined with polythioethers and/or polysulfides used to provide high elongation sealants useful in aerospace applications.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: April 29, 2014
    Assignee: PRC DeSoto International, Inc.
    Inventors: Timothy Blackford, Juexiao Cai, Raquel Keledjian, Renhe Lin, Jose Luzano, Chandra B. Rao, Bruce Virnelson
  • Polyurea/polythiourea coatings
    Patent number: 8623989
    Abstract: Polyurea/polythiourea compositions comprising the reaction product of a first component comprising isocyanate and a second component comprising an amine, wherein the first component further comprises an isocyanate functional polythioether-polyurethane and/or polythiourethane, and/or the second component further comprises an amine/hydroxy functional polythioether, are disclosed. Methods for using the coating, and substrates coated therewith, are also disclosed.
    Type: Grant
    Filed: July 3, 2007
    Date of Patent: January 7, 2014
    Assignee: PRC De Soto International, Inc.
    Inventors: Howard Senkfor, Thomas R. Hockswender, Nina Bojkova, Paul P. Greigger, Gregory J. McCollum, John R. Gilmore, Chandra B. Rao
  • POLYUREA/POLYTHIOUREA COATINGS
    Publication number: 20130344340
    Abstract: Polyurea/polythiourea compositions comprising the reaction product of a first component comprising isocyanate and a second component comprising an amine, wherein the first component further comprises an isocyanate functional polythioether-polyurethane and/or polythiourethane, and/or the second component further comprises an amine/hydroxy functional polythioether, are disclosed. Methods for using the coating, and substrates coated therewith, are also disclosed.
    Type: Application
    Filed: July 3, 2007
    Publication date: December 26, 2013
    Inventors: Howard Senkfor, Thomas R. Hockswender, Nina Bojkova, Paul P. Greigger, Gregory J. McCollum, John R. Gilmore, Chandra B. Rao
  • POLYFUNCTIONAL SULFUR-CONTAINING EPOXIES AND COMPOSITIONS THEREOF
    Publication number: 20130345372
    Abstract: Disclosed are polyfunctional sulfur-containing epoxies and compositions containing polyfunctional sulfur-containing epoxies. The polyfunctional sulfur-containing epoxies may be used as a curing agent and combined with polythioethers and/or polysulfides used to provide high elongation sealants useful in aerospace applications.
    Type: Application
    Filed: June 21, 2012
    Publication date: December 26, 2013
    Applicant: PRC-DeSoto International, Inc.
    Inventors: Timothy Blackford, Juexiao Cai, Raquel Keledjian, Renhe Lin, Jose Lozano, Chandra B. Rao, Bruce Virnelson
  • Selectively strippable intermediate coatings and methods of use
    Patent number: 8557386
    Abstract: Selectively strippable coating compositions comprising at least one amine-terminated polyamide are disclosed. Multi-layer coatings formed from the selectively strippable coating compositions, and methods of using coating compositions comprising at least one amine-terminated polyamide to facilitate selective removal of an adjoining coating by a stripper are also disclosed.
    Type: Grant
    Filed: November 17, 2004
    Date of Patent: October 15, 2013
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Suresh G. Sawant, Chandra B. Rao, Srintorn Charonsuck
  • Thioethers, methods for their preparation, and compositions including such thioethers
    Patent number: 8481627
    Abstract: Disclosed are thioethers, methods for preparing such thioethers, and curable compositions, such as coating and sealant compositions, that include such thioethers. The thioethers can be the reaction product of (a) an alpha, omega dihalo organic compound, (b) a metal hydrosulfide, and (c) a metal hydroxide.
    Type: Grant
    Filed: December 13, 2010
    Date of Patent: July 9, 2013
    Assignee: PRC DeSoto International, Inc.
    Inventors: John R. Gilmore, Chandra B. Rao
  • Thioethers, methods for their preparation, and compositions including such thioethers
    Patent number: 8466220
    Abstract: Disclosed are thioethers, methods for preparing such thioethers, and curable compositions, such as coating and sealant compositions, that include such thioethers. The thioethers can be the reaction product of (a) an alpha, omega dihalo organic compound, (b) a metal hydrosulfide and (c) a metal hydroxide.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: June 18, 2013
    Assignee: PRC DeSoto International, Inc
    Inventors: Chandra B. Rao, Juexiao Cai, Marfi Ito, John Gilmore
  • Compositions including a polythioether
    Patent number: 8138273
    Abstract: Compositions, such as aerospace sealant, coating, and/or potting compositions are disclosed. The compositions include a polythioether and, in at least some cases, can be sprayable and fuel resistant even when substantially free of volatile organic compounds.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: March 20, 2012
    Assignee: PRC DeSoto International, Inc
    Inventors: Chandra B. Rao, John R. Gilmore
  • POLYTHIOETHER POLYMERS, METHODS FOR PREPARATION THEREOF, AND COMPOSITIONS COMPRISING THEM
    Publication number: 20110319559
    Abstract: Disclosed are polythioethers that are the reaction product of reactants that include: a) an isocyanurate-containing trithiol; b) a polythiol different from (a); and c) a diene. Also disclosed are compositions, such as sealant compositions, that include such polythioethers.
    Type: Application
    Filed: June 25, 2010
    Publication date: December 29, 2011
    Applicant: PRC-DeSolo International, Inc.
    Inventors: Charles M. Kania, Renhe Lin, Chandra B. Rao
  • Dimercaptan terminated polythioether polymers and methods for making and using the same
    Patent number: 8076420
    Abstract: Dimercaptan terminated polythioether polymers are disclosed, as are methods for making and using the same.
    Type: Grant
    Filed: November 15, 2010
    Date of Patent: December 13, 2011
    Assignee: PRC DeSoto International, Inc
    Inventors: Suresh G. Sawant, Chandra B. Rao, Michael A. Cosman
  • Compositions Including a Polythioether
    Publication number: 20110092639
    Abstract: Compositions, such as aerospace sealant, coating, and/or potting compositions are disclosed. The compositions include a polythioether and, in at least some cases, can be sprayable and fuel resistant even when substantially free of volatile organic compounds.
    Type: Application
    Filed: December 17, 2010
    Publication date: April 21, 2011
    Applicant: PRC-DeSoto International, Inc.
    Inventors: Chandra B. Rao, John R. Gilmore
  • THIOETHERS, METHODS FOR THEIR PREPARATION, AND COMPOSITIONS INCLUDING SUCH THIOETHERS
    Publication number: 20110077351
    Abstract: Disclosed are thioethers, methods for preparing such thioethers, and curable compositions, such as coating and sealant compositions, that include such thioethers. The thioethers can be the reaction product of (a) an alpha, omega dihalo organic compound, (b) a metal hydrosulfide, and (c) a metal hydroxide.
    Type: Application
    Filed: December 13, 2010
    Publication date: March 31, 2011
    Applicant: PRC-DeSoto International, Inc.
    Inventors: John R. Gilmore, Chandra B. Rao
  • DIMERCAPTAN TERMINATED POLYTHIOETHER POLYMERS AND METHODS FOR MAKING AND USING THE SAME
    Publication number: 20110060091
    Abstract: Dimercaptan terminated polythioether polymers are disclosed, as are methods for making and using the same.
    Type: Application
    Filed: November 15, 2010
    Publication date: March 10, 2011
    Applicant: PRC-DeSoto Internationa, Inc.
    Inventors: Suresh G. Sawant, Chandra B. Rao, Michael A. Cosman
  • Compositions including a polythioether
    Patent number: 7879955
    Abstract: Compositions, such as aerospace sealant, coating, and/or potting compositions are disclosed. The compositions include a polythioether and, in at least some cases, can be sprayable and fuel resistant even when substantially free of volatile organic compounds.
    Type: Grant
    Filed: July 3, 2007
    Date of Patent: February 1, 2011
    Inventors: Chandra B. Rao, John R. Gilmore
  • Thioethers, methods for their preparation, and compositions including such thioethers
    Patent number: 7875666
    Abstract: Disclosed are thioethers, methods for preparing such thioethers, and curable compositions, such as coating and sealant compositions, that include such thioethers. The thioethers can be the reaction product of (a) an alpha, omega dihalo organic compound, (b) a metal hydrosulfide, and (c) a metal hydroxide.
    Type: Grant
    Filed: April 24, 2008
    Date of Patent: January 25, 2011
    Assignee: PRC-De Soto International, Inc.
    Inventors: John R. Gilmore, Chandra B. Rao
  • Dimercaptan terminated polythioether polymers and methods for making and using the same
    Patent number: 7858704
    Abstract: Dimercaptan terminated polythioether polymers are disclosed, as are methods for making and using the same.
    Type: Grant
    Filed: October 19, 2009
    Date of Patent: December 28, 2010
    Assignee: PRC DeSoto International, Inc.
    Inventors: Suresh G. Sawant, Chandra B. Rao, Michael A. Cosman