Patents by Inventor Suri Narayan Dorai

Suri Narayan Dorai 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).

  • Narrowing of poly (tetramethylene ether) glycol
    Patent number: 6355846
    Abstract: A process for producing a poly(tetramethylene ether) glycol (PTMEG) or copolymer having a narrowed molecular weight ratio of 1.9 to 2.07 and a dispersity of 1.2 to 1.65 from a starting PTMEG or copolymer with a broader molecular weight distribution having a dispersity of 1.9 to 2.3 and a molecular weight ratio of 2.3 to 2.6 is provided by feeding the PTMEG or copolymer and an effective amount of an inert solvent to a stripping apparatus and stripping at a temperature of 150 to 220 degrees C. and a pressure of 0.5 to 5 mm of mercury.
    Type: Grant
    Filed: October 17, 2000
    Date of Patent: March 12, 2002
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Suri Narayan Dorai, Richard Edward Ernst