Patents by Inventor Ponswamy Rajalingam

Ponswamy Rajalingam 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).

  • Bituminous polyurethane interpenetrating elastomeric network compositions as coatings and sealants for roofing and other applications
    Publication number: 20040019136
    Abstract: Elastomeric polyurethane interpenetrating network compositions are disclosed which are preferably developed by in situ reaction of polyols with different isocyanates and polyisocyanates in a bituminous material, such as, asphalt, coal tar, polymer modified asphalt, oxidized, and unoxidized asphalt. The composition is preferably formed at a temperature between 200° F. and 350° F. The reaction kinetics can be accelerated by including catalysts and curing agents. Bituminous polyurethane interpenetrating network elastomers are suitable for a wide variety of applications including but not limited to roofing, new construction, and wall and foundation waterproofing applications.
    Type: Application
    Filed: March 24, 2003
    Publication date: January 29, 2004
    Inventors: Ponswamy Rajalingam, Umarani Rajalingam
  • Bituminous polyurethane interpenetrating elastomeric network compositions as coatings and sealants for roofing and other applications
    Patent number: 6538060
    Abstract: Elastomeric polyurethane interpenetrating network compositions are disclosed which are preferably developed by in situ reaction of polyols with different isocyanates and polyisocyanates in a bituminous material, such as, asphalt, coal tar, polymer modified asphalt, oxidized, and unoxidized asphalt. The composition is preferably formed at a temperature between 200° F. and 350° F. The reaction kinetics can be accelerated by including catalysts and curing agents. Bituminous polyurethane interpenetrating network elastomers are suitable for a wide variety of applications including but not limited to roofing, new construction, and wall and foundation waterproofing applications.
    Type: Grant
    Filed: June 27, 2001
    Date of Patent: March 25, 2003
    Assignee: Urecoats International, Inc.
    Inventors: Ponswamy Rajalingam, Umarani Rajalingam
  • Bituminous polyurethane interpenetrating elastomeric network compositions as coatings and sealants for roofing and other applications
    Publication number: 20010051676
    Abstract: Elastomeric polyurethane interpenetrating network compositions are disclosed which are preferably developed by in situ reaction of polyols with different isocyanates and polyisocyanates in a bituminous material, such as, asphalt, coal tar, polymer modified asphalt, oxidized, and unoxidized asphalt. The composition is preferably formed at a temperature between 200° F. and 350° F. The reaction kinetics can be accelerated by including catalysts and curing agents. Bituminous polyurethane interpenetrating network elastomers are suitable for a wide variety of applications including but not limited to roofing, new construction, and wall and foundation waterproofing applications.
    Type: Application
    Filed: June 27, 2001
    Publication date: December 13, 2001
    Inventors: Ponswamy Rajalingam, Umarani Rajalingam
  • Bituminous polyurethane interpenetrating elastomeric network compositions as coatings and sealants for roofing and other applications
    Patent number: 6271305
    Abstract: The elastomeric polyurethane interpenetrating network compositions of the invention are developed by in situ reaction of polyols with different isocyanates and polyisocyanates in bituminous material. Suitable bituminous materials include asphalt, coal tar, polymer modified asphalt, oxidized, and unoxidized asphalt. The composition is preferably formed at a temperature between 200° F. and 350° F. The reaction kinetics can be accelerated by including catalysts and curing agents. The reaction kinetics were followed by measuring the torque increase as a function of reaction time. The gelation time is measured at the maximum torque. For testing, the bituminous polyurethane interpenetrating network elastomeric compositions were hot-sprayed-applied (200° F.-350° F.) on different substrates such as concrete, metal, wood, built-up roofing systems, polyurethane foams, and other construction materials with a specially designed spray applicator system.
    Type: Grant
    Filed: August 19, 1999
    Date of Patent: August 7, 2001
    Assignee: Urecoats Technologies, Inc.
    Inventors: Ponswamy Rajalingam, Umarani Rajalingam